diff --git a/mock-service/src/config/mock-config/TRV14/2.0.0/on_select/class.ts b/mock-service/src/config/mock-config/TRV14/2.0.0/on_select/class.ts
index df6d7112..6225ac74 100644
--- a/mock-service/src/config/mock-config/TRV14/2.0.0/on_select/class.ts
+++ b/mock-service/src/config/mock-config/TRV14/2.0.0/on_select/class.ts
@@ -28,30 +28,65 @@ export class MockOnSelectClass extends MockAction {
     generator(existingPayload: any, sessionData: SessionData): Promise<any> {
         return onSelectDefaultGenerator(existingPayload, sessionData);
     }
-    async validate(targetPayload: any): Promise<MockOutput> {
+    async validate(targetPayload: any, sessionData: SessionData): Promise<MockOutput> {
+        const order = targetPayload?.message?.order;
+        if (!order) return { valid: false, message: "Order not found in message", code: "MISSING_ORDER" };
+
+        const provider = order.provider;
+        if (!provider) return { valid: false, message: "Provider not found in order", code: "MISSING_PROVIDER" };
+
+        if (sessionData.selected_provider && provider.id !== sessionData.selected_provider.id)
+            return { valid: false, message: `Provider ID mismatch with selected provider: ${sessionData.selected_provider.id}`, code: "ID_MISMATCH" };
+
+        const fulfillments = order.fulfillments;
+        if (sessionData.selected_fulfillments && fulfillments) {
+            const validFulfillmentIds = new Set(sessionData.selected_fulfillments.map((f: any) => f.id));
+            const invalidFulfillmentIds = fulfillments.filter((f: any) => !validFulfillmentIds.has(f.id)).map((f: any) => f.id);
+            if (invalidFulfillmentIds.length) {
+                return { valid: false, message: `Fulfillment IDs [${invalidFulfillmentIds.join(", ")}] not found in selected fulfillments`, code: "FULFILLMENT_ID_MISMATCH" };
+            }
+        }
+
+        const items = order.items;
+        if (items) {
+            if (sessionData.selected_items) {
+                const selectedIds = sessionData.selected_items.map((i: any) => i.id);
+                const parentIds = (sessionData.items || [])
+                    .filter((item: any) => selectedIds.includes(item.id) && item.parent_item_id)
+                    .map((item: any) => item.parent_item_id);
+
+                const validItemIds = new Set([...selectedIds, ...parentIds]);
+                const invalidItemIds = items.filter((i: any) => !validItemIds.has(i.id)).map((i: any) => i.id);
+
+                if (invalidItemIds.length) {
+                    return { valid: false, message: `Item IDs [${invalidItemIds.join(", ")}] not found in selected items or their parents`, code: "ITEM_ID_MISMATCH" };
+                }
+            }
+        }
+
         return { valid: true };
     }
     async meetRequirements(sessionData: SessionData): Promise<MockOutput> {
         // Validate required session data for on_select
         if (!sessionData.items || !Array.isArray(sessionData.items)) {
-            return { 
-                valid: false, 
+            return {
+                valid: false,
                 message: "No items available in session data",
                 code: "MISSING_ITEMS"
             };
         }
-        
+
         if (!sessionData.selected_items || !Array.isArray(sessionData.selected_items)) {
-            return { 
-                valid: false, 
+            return {
+                valid: false,
                 message: "No selected_items available in session data",
                 code: "MISSING_SELECTED_ITEMS"
             };
         }
-        
+
         if (sessionData.selected_items.length === 0) {
-            return { 
-                valid: false, 
+            return {
+                valid: false,
                 message: "selected_items array is empty",
                 code: "EMPTY_SELECTED_ITEMS"
             };
@@ -72,7 +107,7 @@ export class MockOnSelectClass extends MockAction {
                 code: "MISSING_SELECTED_FULFILLMENTS"
             };
         }
-        
+
         return { valid: true };
     }
 } 
\ No newline at end of file
diff --git a/mock-service/src/config/mock-config/TRV14/2.0.0/on_select_cultural/class.ts b/mock-service/src/config/mock-config/TRV14/2.0.0/on_select_cultural/class.ts
index fd71b7ad..83837b8c 100644
--- a/mock-service/src/config/mock-config/TRV14/2.0.0/on_select_cultural/class.ts
+++ b/mock-service/src/config/mock-config/TRV14/2.0.0/on_select_cultural/class.ts
@@ -28,7 +28,42 @@ export class MockOnSelectPurchaseCultFormClass extends MockAction {
     generator(existingPayload: any, sessionData: SessionData): Promise<any> {
         return onSelectDefaultGenerator(existingPayload, sessionData);
     }
-    async validate(targetPayload: any): Promise<MockOutput> {
+    async validate(targetPayload: any, sessionData: SessionData): Promise<MockOutput> {
+        const order = targetPayload?.message?.order;
+        if (!order) return { valid: false, message: "Order not found in message", code: "MISSING_ORDER" };
+
+        const provider = order.provider;
+        if (!provider) return { valid: false, message: "Provider not found in order", code: "MISSING_PROVIDER" };
+
+        if (sessionData.selected_provider && provider.id !== sessionData.selected_provider.id)
+            return { valid: false, message: `Provider ID mismatch with selected provider: ${sessionData.selected_provider.id}`, code: "ID_MISMATCH" };
+
+        const fulfillments = order.fulfillments;
+        if (sessionData.selected_fulfillments && fulfillments) {
+            const validFulfillmentIds = new Set(sessionData.selected_fulfillments.map((f: any) => f.id));
+            const invalidFulfillmentIds = fulfillments.filter((f: any) => !validFulfillmentIds.has(f.id)).map((f: any) => f.id);
+            if (invalidFulfillmentIds.length) {
+                return { valid: false, message: `Fulfillment IDs [${invalidFulfillmentIds.join(", ")}] not found in selected fulfillments`, code: "FULFILLMENT_ID_MISMATCH" };
+            }
+        }
+
+        const items = order.items;
+        if (items) {
+            if (sessionData.selected_items) {
+                const selectedIds = sessionData.selected_items.map((i: any) => i.id);
+                const parentIds = (sessionData.items || [])
+                    .filter((item: any) => selectedIds.includes(item.id) && item.parent_item_id)
+                    .map((item: any) => item.parent_item_id);
+
+                const validItemIds = new Set([...selectedIds, ...parentIds]);
+                const invalidItemIds = items.filter((i: any) => !validItemIds.has(i.id)).map((i: any) => i.id);
+
+                if (invalidItemIds.length) {
+                    return { valid: false, message: `Item IDs [${invalidItemIds.join(", ")}] not found in selected items or their parents`, code: "ITEM_ID_MISMATCH" };
+                }
+            }
+        }
+
         return { valid: true };
     }
     async meetRequirements(sessionData: SessionData): Promise<MockOutput> {
diff --git a/mock-service/src/config/mock-config/TRV14/2.0.0/on_select_form_submission/class.ts b/mock-service/src/config/mock-config/TRV14/2.0.0/on_select_form_submission/class.ts
index c37d942a..358ff819 100644
--- a/mock-service/src/config/mock-config/TRV14/2.0.0/on_select_form_submission/class.ts
+++ b/mock-service/src/config/mock-config/TRV14/2.0.0/on_select_form_submission/class.ts
@@ -28,7 +28,42 @@ export class MockOnSelect2Class extends MockAction {
     generator(existingPayload: any, sessionData: SessionData): Promise<any> {
         return onSelect2Generator(existingPayload, sessionData);
     }
-    async validate(targetPayload: any): Promise<MockOutput> {
+    async validate(targetPayload: any, sessionData: SessionData): Promise<MockOutput> {
+        const order = targetPayload?.message?.order;
+        if (!order) return { valid: false, message: "Order not found in message", code: "MISSING_ORDER" };
+
+        const provider = order.provider;
+        if (!provider) return { valid: false, message: "Provider not found in order", code: "MISSING_PROVIDER" };
+
+        if (sessionData.selected_provider && provider.id !== sessionData.selected_provider.id)
+            return { valid: false, message: `Provider ID mismatch with selected provider: ${sessionData.selected_provider.id}`, code: "ID_MISMATCH" };
+
+        const fulfillments = order.fulfillments;
+        if (sessionData.selected_fulfillments && fulfillments) {
+            const validFulfillmentIds = new Set(sessionData.selected_fulfillments.map((f: any) => f.id));
+            const invalidFulfillmentIds = fulfillments.filter((f: any) => !validFulfillmentIds.has(f.id)).map((f: any) => f.id);
+            if (invalidFulfillmentIds.length) {
+                return { valid: false, message: `Fulfillment IDs [${invalidFulfillmentIds.join(", ")}] not found in selected fulfillments`, code: "FULFILLMENT_ID_MISMATCH" };
+            }
+        }
+
+        const items = order.items;
+        if (items) {
+            if (sessionData.selected_items) {
+                const selectedIds = sessionData.selected_items.map((i: any) => i.id);
+                const parentIds = (sessionData.items || [])
+                    .filter((item: any) => selectedIds.includes(item.id) && item.parent_item_id)
+                    .map((item: any) => item.parent_item_id);
+
+                const validItemIds = new Set([...selectedIds, ...parentIds]);
+                const invalidItemIds = items.filter((i: any) => !validItemIds.has(i.id)).map((i: any) => i.id);
+
+                if (invalidItemIds.length) {
+                    return { valid: false, message: `Item IDs [${invalidItemIds.join(", ")}] not found in selected items or their parents`, code: "ITEM_ID_MISMATCH" };
+                }
+            }
+        }
+
         return { valid: true };
     }
     async meetRequirements(sessionData: SessionData): Promise<MockOutput> {
diff --git a/mock-service/src/config/mock-config/TRV14/2.0.0/on_select_form_submission_culture/class.ts b/mock-service/src/config/mock-config/TRV14/2.0.0/on_select_form_submission_culture/class.ts
index ed916d0e..25f8dbb1 100644
--- a/mock-service/src/config/mock-config/TRV14/2.0.0/on_select_form_submission_culture/class.ts
+++ b/mock-service/src/config/mock-config/TRV14/2.0.0/on_select_form_submission_culture/class.ts
@@ -28,7 +28,42 @@ export class MockOnSelectPurchaseCultureClass extends MockAction {
     generator(existingPayload: any, sessionData: SessionData): Promise<any> {
         return onSelect2Generator(existingPayload, sessionData);
     }
-    async validate(targetPayload: any): Promise<MockOutput> {
+    async validate(targetPayload: any, sessionData: SessionData): Promise<MockOutput> {
+        const order = targetPayload?.message?.order;
+        if (!order) return { valid: false, message: "Order not found in message", code: "MISSING_ORDER" };
+
+        const provider = order.provider;
+        if (!provider) return { valid: false, message: "Provider not found in order", code: "MISSING_PROVIDER" };
+
+        if (sessionData.selected_provider && provider.id !== sessionData.selected_provider.id)
+            return { valid: false, message: `Provider ID mismatch with selected provider: ${sessionData.selected_provider.id}`, code: "ID_MISMATCH" };
+
+        const fulfillments = order.fulfillments;
+        if (sessionData.selected_fulfillments && fulfillments) {
+            const validFulfillmentIds = new Set(sessionData.selected_fulfillments.map((f: any) => f.id));
+            const invalidFulfillmentIds = fulfillments.filter((f: any) => !validFulfillmentIds.has(f.id)).map((f: any) => f.id);
+            if (invalidFulfillmentIds.length) {
+                return { valid: false, message: `Fulfillment IDs [${invalidFulfillmentIds.join(", ")}] not found in selected fulfillments`, code: "FULFILLMENT_ID_MISMATCH" };
+            }
+        }
+
+        const items = order.items;
+        if (items) {
+            if (sessionData.selected_items) {
+                const selectedIds = sessionData.selected_items.map((i: any) => i.id);
+                const parentIds = (sessionData.items || [])
+                    .filter((item: any) => selectedIds.includes(item.id) && item.parent_item_id)
+                    .map((item: any) => item.parent_item_id);
+
+                const validItemIds = new Set([...selectedIds, ...parentIds]);
+                const invalidItemIds = items.filter((i: any) => !validItemIds.has(i.id)).map((i: any) => i.id);
+
+                if (invalidItemIds.length) {
+                    return { valid: false, message: `Item IDs [${invalidItemIds.join(", ")}] not found in selected items or their parents`, code: "ITEM_ID_MISMATCH" };
+                }
+            }
+        }
+
         return { valid: true };
     }
     async meetRequirements(sessionData: SessionData): Promise<MockOutput> {
diff --git a/mock-service/src/config/mock-config/TRV14/2.0.0/on_select_without_form/class.ts b/mock-service/src/config/mock-config/TRV14/2.0.0/on_select_without_form/class.ts
index 3426e1d3..37fc09c2 100644
--- a/mock-service/src/config/mock-config/TRV14/2.0.0/on_select_without_form/class.ts
+++ b/mock-service/src/config/mock-config/TRV14/2.0.0/on_select_without_form/class.ts
@@ -28,30 +28,67 @@ export class MockOnSelectWithoutFormClass extends MockAction {
     generator(existingPayload: any, sessionData: SessionData): Promise<any> {
         return onSelectWithoutFormGenerator(existingPayload, sessionData);
     }
-    async validate(targetPayload: any): Promise<MockOutput> {
+    async validate(targetPayload: any, sessionData: SessionData): Promise<MockOutput> {
+        const order = targetPayload?.message?.order;
+        if (!order) return { valid: false, message: "Order not found in message", code: "MISSING_ORDER" };
+
+        const provider = order.provider;
+        if (!provider) return { valid: false, message: "Provider not found in order", code: "MISSING_PROVIDER" };
+
+        if (sessionData.selected_provider && provider.id !== sessionData.selected_provider.id)
+            return { valid: false, message: `Provider ID mismatch with selected provider: ${sessionData.selected_provider.id}`, code: "ID_MISMATCH" };
+
+        const fulfillments = order.fulfillments;
+        if (sessionData.selected_fulfillments && fulfillments) {
+            const validFulfillmentIds = new Set(sessionData.selected_fulfillments.map((f: any) => f.id));
+            const invalidFulfillmentIds = fulfillments.filter((f: any) => !validFulfillmentIds.has(f.id)).map((f: any) => f.id);
+            if (invalidFulfillmentIds.length) {
+                return { valid: false, message: `Fulfillment IDs [${invalidFulfillmentIds.join(", ")}] not found in selected fulfillments`, code: "FULFILLMENT_ID_MISMATCH" };
+            }
+        }
+
+        const items = order.items;
+        if (items) {
+
+
+            if (sessionData.selected_items) {
+                const selectedIds = sessionData.selected_items.map((i: any) => i.id);
+                const parentIds = (sessionData.items || [])
+                    .filter((item: any) => selectedIds.includes(item.id) && item.parent_item_id)
+                    .map((item: any) => item.parent_item_id);
+
+                const validItemIds = new Set([...selectedIds, ...parentIds]);
+                const invalidItemIds = items.filter((i: any) => !validItemIds.has(i.id)).map((i: any) => i.id);
+
+                if (invalidItemIds.length) {
+                    return { valid: false, message: `Item IDs [${invalidItemIds.join(", ")}] not found in selected items or their parents`, code: "ITEM_ID_MISMATCH" };
+                }
+            }
+        }
+
         return { valid: true };
     }
     async meetRequirements(sessionData: SessionData): Promise<MockOutput> {
         // Validate required session data for on_select
         if (!sessionData.items || !Array.isArray(sessionData.items)) {
-            return { 
-                valid: false, 
+            return {
+                valid: false,
                 message: "No items available in session data",
                 code: "MISSING_ITEMS"
             };
         }
-        
+
         if (!sessionData.selected_items || !Array.isArray(sessionData.selected_items)) {
-            return { 
-                valid: false, 
+            return {
+                valid: false,
                 message: "No selected_items available in session data",
                 code: "MISSING_SELECTED_ITEMS"
             };
         }
-        
+
         if (sessionData.selected_items.length === 0) {
-            return { 
-                valid: false, 
+            return {
+                valid: false,
                 message: "selected_items array is empty",
                 code: "EMPTY_SELECTED_ITEMS"
             };
@@ -72,7 +109,7 @@ export class MockOnSelectWithoutFormClass extends MockAction {
                 code: "MISSING_SELECTED_FULFILLMENTS"
             };
         }
-        
+
         return { valid: true };
     }
 } 
\ No newline at end of file
diff --git a/mock-service/src/config/mock-config/TRV14/2.0.0/select/class.ts b/mock-service/src/config/mock-config/TRV14/2.0.0/select/class.ts
index 51724622..e4fd685c 100644
--- a/mock-service/src/config/mock-config/TRV14/2.0.0/select/class.ts
+++ b/mock-service/src/config/mock-config/TRV14/2.0.0/select/class.ts
@@ -28,25 +28,54 @@ export class MockSelectClass extends MockAction {
     generator(existingPayload: any, sessionData: SessionData): Promise<any> {
         return selectDefaultGenerator(existingPayload, sessionData);
     }
-    async validate(targetPayload: any): Promise<MockOutput> {
+    async validate(targetPayload: any, sessionData: SessionData): Promise<MockOutput> {
+        const order = targetPayload?.message?.order;
+        const provider = order?.provider;
+        if (!provider) return { valid: false, message: "Provider not found", code: "MISSING_PROVIDER" };
+
+        if (sessionData.provider_id && provider.id !== sessionData.provider_id)
+            return { valid: false, message: `Provider ID mismatch with session: ${sessionData.provider_id}`, code: "ID_MISMATCH" };
+
+        const fulfillments = order?.fulfillments;
+        if (sessionData.fulfillments && fulfillments) {
+            const validFulfillmentIds = new Set(sessionData.fulfillments.map((f: any) => f.id));
+            const invalidFulfillmentIds = fulfillments.filter((f: any) => !validFulfillmentIds.has(f.id)).map((f: any) => f.id);
+            if (invalidFulfillmentIds.length) {
+                return { valid: false, message: `Fulfillment IDs [${invalidFulfillmentIds.join(", ")}] not found in previous search results`, code: "FULFILLMENT_ID_MISMATCH" };
+            }
+        }
+
+        if (order?.items) {
+            const selecteditems = order.items;
+            const itemsOnsearch = sessionData.items;
+
+            if (itemsOnsearch) {
+                const validItemIds = new Set(itemsOnsearch.map((i: any) => i.id));
+                const invalidItemIds = selecteditems.filter((i: any) => !validItemIds.has(i.id)).map((i: any) => i.id);
+                if (invalidItemIds.length) {
+                    return { valid: false, message: `Item IDs [${invalidItemIds.join(", ")}] not found in previous search results`, code: "ITEM_ID_MISMATCH" };
+                }
+            }
+        }
+
         return { valid: true };
     }
     async meetRequirements(sessionData: SessionData): Promise<MockOutput> {
         // Validate user_inputs structure exists
         if (!sessionData.user_inputs) {
-            return { 
-                valid: false, 
+            return {
+                valid: false,
                 message: "user_inputs not found in session data",
                 code: "MISSING_USER_INPUTS"
             };
         }
 
-        const userInputs : any = sessionData.user_inputs;
+        const userInputs: any = sessionData.user_inputs;
 
         // Validate provider
         if (!userInputs.provider) {
-            return { 
-                valid: false, 
+            return {
+                valid: false,
                 message: "provider is required in user_inputs",
                 code: "MISSING_PROVIDER"
             };
@@ -54,8 +83,8 @@ export class MockSelectClass extends MockAction {
 
         // Validate fulfillment
         if (!userInputs.fulfillment) {
-            return { 
-                valid: false, 
+            return {
+                valid: false,
                 message: "fulfillment is required in user_inputs",
                 code: "MISSING_FULFILLMENT"
             };
@@ -63,8 +92,8 @@ export class MockSelectClass extends MockAction {
 
         // Validate items array
         if (!userInputs.items || !Array.isArray(userInputs.items) || userInputs.items.length === 0) {
-            return { 
-                valid: false, 
+            return {
+                valid: false,
                 message: "items array is required and must not be empty in user_inputs",
                 code: "MISSING_OR_EMPTY_ITEMS"
             };
@@ -74,14 +103,14 @@ export class MockSelectClass extends MockAction {
         for (let i = 0; i < userInputs.items.length; i++) {
             const item = userInputs.items[i];
             if (!item.itemId) {
-                return { 
-                    valid: false, 
+                return {
+                    valid: false,
                     message: `itemId is required for item at index ${i}`,
                     code: "MISSING_ITEM_ID"
                 };
             }
         }
-        
+
         return { valid: true };
     }
 } 
\ No newline at end of file
diff --git a/mock-service/src/config/mock-config/TRV14/2.0.0/select_for_partial_cancellation/class.ts b/mock-service/src/config/mock-config/TRV14/2.0.0/select_for_partial_cancellation/class.ts
index 76040f0f..dacc3f45 100644
--- a/mock-service/src/config/mock-config/TRV14/2.0.0/select_for_partial_cancellation/class.ts
+++ b/mock-service/src/config/mock-config/TRV14/2.0.0/select_for_partial_cancellation/class.ts
@@ -28,25 +28,56 @@ export class MockSelectForPartialCancellationClass extends MockAction {
     generator(existingPayload: any, sessionData: SessionData): Promise<any> {
         return selectForPartialCancellationGenerator(existingPayload, sessionData);
     }
-    async validate(targetPayload: any): Promise<MockOutput> {
+    async validate(targetPayload: any, sessionData: SessionData): Promise<MockOutput> {
+        const order = targetPayload?.message?.order;
+        if (!order) return { valid: false, message: "Order not found in message", code: "MISSING_ORDER" };
+
+        const provider = order.provider;
+        if (!provider) return { valid: false, message: "Provider not found in order", code: "MISSING_PROVIDER" };
+
+        if (sessionData.provider_id && provider.id !== sessionData.provider_id)
+            return { valid: false, message: `Provider ID mismatch with session: ${sessionData.provider_id}`, code: "ID_MISMATCH" };
+
+        const fulfillments = order.fulfillments;
+        if (sessionData.fulfillments && fulfillments) {
+            const validFulfillmentIds = new Set(sessionData.fulfillments.map((f: any) => f.id));
+            const invalidFulfillmentIds = fulfillments.filter((f: any) => !validFulfillmentIds.has(f.id)).map((f: any) => f.id);
+            if (invalidFulfillmentIds.length) {
+                return { valid: false, message: `Fulfillment IDs [${invalidFulfillmentIds.join(", ")}] not found in previous search results`, code: "FULFILLMENT_ID_MISMATCH" };
+            }
+        }
+
+        if (order.items) {
+            const selectedItems = order.items;
+            const itemsOnsearch = sessionData.items;
+
+            if (itemsOnsearch) {
+                const validItemIds = new Set(itemsOnsearch.map((i: any) => i.id));
+                const invalidItemIds = selectedItems.filter((i: any) => !validItemIds.has(i.id)).map((i: any) => i.id);
+                if (invalidItemIds.length) {
+                    return { valid: false, message: `Item IDs [${invalidItemIds.join(", ")}] not found in previous search results`, code: "ITEM_ID_MISMATCH" };
+                }
+            }
+        }
+
         return { valid: true };
     }
     async meetRequirements(sessionData: SessionData): Promise<MockOutput> {
         // Validate user_inputs structure exists
         if (!sessionData.user_inputs) {
-            return { 
-                valid: false, 
+            return {
+                valid: false,
                 message: "user_inputs not found in session data",
                 code: "MISSING_USER_INPUTS"
             };
         }
 
-        const userInputs : any = sessionData.user_inputs;
+        const userInputs: any = sessionData.user_inputs;
 
         // Validate provider
         if (!userInputs.provider) {
-            return { 
-                valid: false, 
+            return {
+                valid: false,
                 message: "provider is required in user_inputs",
                 code: "MISSING_PROVIDER"
             };
@@ -54,8 +85,8 @@ export class MockSelectForPartialCancellationClass extends MockAction {
 
         // Validate fulfillment
         if (!userInputs.fulfillment) {
-            return { 
-                valid: false, 
+            return {
+                valid: false,
                 message: "fulfillment is required in user_inputs",
                 code: "MISSING_FULFILLMENT"
             };
@@ -63,8 +94,8 @@ export class MockSelectForPartialCancellationClass extends MockAction {
 
         // Validate items array
         if (!userInputs.items || !Array.isArray(userInputs.items) || userInputs.items.length === 0) {
-            return { 
-                valid: false, 
+            return {
+                valid: false,
                 message: "items array is required and must not be empty in user_inputs",
                 code: "MISSING_OR_EMPTY_ITEMS"
             };
@@ -74,8 +105,8 @@ export class MockSelectForPartialCancellationClass extends MockAction {
         for (let i = 0; i < userInputs.items.length; i++) {
             const item = userInputs.items[i];
             if (!item.itemId) {
-                return { 
-                    valid: false, 
+                return {
+                    valid: false,
                     message: `itemId is required for item at index ${i}`,
                     code: "MISSING_ITEM_ID"
                 };
@@ -85,13 +116,13 @@ export class MockSelectForPartialCancellationClass extends MockAction {
         // IMPORTANT: Validate first item has quantity > 1 for partial cancellation
         const firstItem = userInputs.items[0];
         if (!firstItem.count || typeof firstItem.count !== 'number' || firstItem.count <= 1) {
-            return { 
-                valid: false, 
+            return {
+                valid: false,
                 message: "First item must have quantity > 1 for partial cancellation flow (found: " + (firstItem.count || 0) + ")",
                 code: "INSUFFICIENT_QUANTITY_FOR_PARTIAL_CANCELLATION"
             };
         }
-        
+
         return { valid: true };
     }
 }
\ No newline at end of file
diff --git a/mock-service/src/config/mock-config/TRV14/2.0.0/select_form_submission/class.ts b/mock-service/src/config/mock-config/TRV14/2.0.0/select_form_submission/class.ts
index 30c2f14a..afabc29c 100644
--- a/mock-service/src/config/mock-config/TRV14/2.0.0/select_form_submission/class.ts
+++ b/mock-service/src/config/mock-config/TRV14/2.0.0/select_form_submission/class.ts
@@ -28,7 +28,37 @@ export class MockSelect2Class extends MockAction {
     generator(existingPayload: any, sessionData: SessionData): Promise<any> {
         return select2Generator(existingPayload, sessionData);
     }
-    async validate(targetPayload: any): Promise<MockOutput> {
+    async validate(targetPayload: any, sessionData: SessionData): Promise<MockOutput> {
+        const order = targetPayload?.message?.order;
+        if (!order) return { valid: false, message: "Order not found in message", code: "MISSING_ORDER" };
+
+        const provider = order.provider;
+        if (!provider) return { valid: false, message: "Provider not found in order", code: "MISSING_PROVIDER" };
+
+        if (sessionData.provider_id && provider.id !== sessionData.provider_id)
+            return { valid: false, message: `Provider ID mismatch with session: ${sessionData.provider_id}`, code: "ID_MISMATCH" };
+
+        const fulfillments = order.fulfillments;
+        if (sessionData.fulfillments && fulfillments) {
+            const validFulfillmentIds = new Set(sessionData.fulfillments.map((f: any) => f.id));
+            const invalidFulfillmentIds = fulfillments.filter((f: any) => !validFulfillmentIds.has(f.id)).map((f: any) => f.id);
+            if (invalidFulfillmentIds.length) {
+                return { valid: false, message: `Fulfillment IDs [${invalidFulfillmentIds.join(", ")}] not found in previous search results`, code: "FULFILLMENT_ID_MISMATCH" };
+            }
+        }
+
+        const items = order.items;
+        if (items) {
+
+            if (sessionData.items) {
+                const validItemIds = new Set(sessionData.items.map((i: any) => i.id));
+                const invalidIds = items.filter((i: any) => !validItemIds.has(i.id)).map((i: any) => i.id);
+                if (invalidIds.length) {
+                    return { valid: false, message: `Item IDs [${invalidIds.join(", ")}] not found in previous search results`, code: "ITEM_ID_MISMATCH" };
+                }
+            }
+        }
+
         return { valid: true };
     }
     async meetRequirements(sessionData: SessionData): Promise<MockOutput> {
diff --git a/mock-service/src/config/mock-config/TRV14/2.0.0/select_form_submission_cultural/class.ts b/mock-service/src/config/mock-config/TRV14/2.0.0/select_form_submission_cultural/class.ts
index 3aac3757..7a52b417 100644
--- a/mock-service/src/config/mock-config/TRV14/2.0.0/select_form_submission_cultural/class.ts
+++ b/mock-service/src/config/mock-config/TRV14/2.0.0/select_form_submission_cultural/class.ts
@@ -28,7 +28,36 @@ export class MockSelectPurchaseCultureClass extends MockAction {
     generator(existingPayload: any, sessionData: SessionData): Promise<any> {
         return selectPurchaseCultureGenerator(existingPayload, sessionData);
     }
-    async validate(targetPayload: any): Promise<MockOutput> {
+    async validate(targetPayload: any, sessionData: SessionData): Promise<MockOutput> {
+        const order = targetPayload?.message?.order;
+        if (!order) return { valid: false, message: "Order not found in message", code: "MISSING_ORDER" };
+
+        const provider = order.provider;
+        if (!provider) return { valid: false, message: "Provider not found in order", code: "MISSING_PROVIDER" };
+
+        if (sessionData.provider_id && provider.id !== sessionData.provider_id)
+            return { valid: false, message: `Provider ID mismatch with session: ${sessionData.provider_id}`, code: "ID_MISMATCH" };
+
+        const fulfillments = order.fulfillments;
+        if (sessionData.fulfillments && fulfillments) {
+            const validFulfillmentIds = new Set(sessionData.fulfillments.map((f: any) => f.id));
+            const invalidFulfillmentIds = fulfillments.filter((f: any) => !validFulfillmentIds.has(f.id)).map((f: any) => f.id);
+            if (invalidFulfillmentIds.length) {
+                return { valid: false, message: `Fulfillment IDs [${invalidFulfillmentIds.join(", ")}] not found in previous search results`, code: "FULFILLMENT_ID_MISMATCH" };
+            }
+        }
+
+        const items = order.items;
+        if (items) {
+            if (sessionData.items) {
+                const validItemIds = new Set(sessionData.items.map((i: any) => i.id));
+                const invalidIds = items.filter((i: any) => !validItemIds.has(i.id)).map((i: any) => i.id);
+                if (invalidIds.length) {
+                    return { valid: false, message: `Item IDs [${invalidIds.join(", ")}] not found in previous search results`, code: "ITEM_ID_MISMATCH" };
+                }
+            }
+        }
+
         return { valid: true };
     }
     async meetRequirements(sessionData: SessionData): Promise<MockOutput> {