diff --git a/fplus-lib/src/core/application/lifecycle.rs b/fplus-lib/src/core/application/lifecycle.rs
index 3ab29c1..f652dfc 100644
--- a/fplus-lib/src/core/application/lifecycle.rs
+++ b/fplus-lib/src/core/application/lifecycle.rs
@@ -46,25 +46,31 @@ impl LifeCycle {
 
     /// Change Application state to Proposal from Governance Review
     /// Actor input is the actor who is changing the state
-    pub fn finish_governance_review(&self, actor: String, current_allocation_id: String) -> Self {
-        LifeCycle {
+    pub fn finish_governance_review(&self, actor: String, current_allocation_id: String) -> Result<Self, String> {
+        let new_lifecycle = LifeCycle {
             state: AppState::ReadyToSign,
             validated_by: actor,
             validated_at: Utc::now().to_string(),
             updated_at: Utc::now().to_string(),
             active_request: Some(current_allocation_id),
             ..self.clone()
-        }
+        };
+
+        new_lifecycle.validate()?;
+        Ok(new_lifecycle)
     }
 
-    pub fn sign_grant_datacap_proposal(&self, validated_by: &str) -> Self {
-        LifeCycle {
+    pub fn sign_grant_datacap_proposal(&self, validated_by: &str) -> Result<Self, String> {
+        let new_lifecycle = LifeCycle {
             state: AppState::StartSignDatacap,
             updated_at: Utc::now().to_string(),
             validated_by: validated_by.into(),
             validated_at: Utc::now().to_string(),
             ..self.clone()
-        }
+        };
+
+        new_lifecycle.validate()?;
+        Ok(new_lifecycle)
     }
 
     pub fn update_lifecycle_after_sign(
@@ -154,4 +160,38 @@ impl LifeCycle {
             ..self.clone()
         }
     }
+
+    pub fn validate(&self) -> Result<(), String> {
+        if self.client_on_chain_address.is_empty() {
+            return Err("Client on-chain address is required".to_string());
+        }
+        if self.multisig_address.is_empty() {
+            return Err("Multisig address is required".to_string());
+        }
+
+        match self.state {
+            AppState::Granted | AppState::StartSignDatacap => {
+                if self.validated_by.is_empty() {
+                    return Err("Validated by is required for Granted/StartSignDatacap state".to_string());
+                }
+                if self.validated_at.is_empty() {
+                    return Err("Validated at is required for Granted/StartSignDatacap state".to_string());
+                }
+            }
+            AppState::ReadyToSign => {
+                if self.validated_by.is_empty() {
+                    return Err("Validated by is required for ReadyToSign state".to_string());
+                }
+                if self.validated_at.is_empty() {
+                    return Err("Validated at is required for ReadyToSign state".to_string());
+                }
+                if self.active_request.is_none() || self.active_request.as_ref().unwrap().is_empty() {
+                    return Err("Active request ID is required for ReadyToSign state".to_string());
+                }
+            }
+            _ => {}
+        }
+
+        Ok(())
+    }
 }
diff --git a/fplus-lib/src/core/application/mod.rs b/fplus-lib/src/core/application/mod.rs
index c85472d..f146e84 100644
--- a/fplus-lib/src/core/application/mod.rs
+++ b/fplus-lib/src/core/application/mod.rs
@@ -124,21 +124,25 @@ impl file::ApplicationFile {
         sps_change_request: &SpsChangeRequest,
         app_state: &AppState,
         request_id: &String,
-    ) -> Self {
-        let new_life_cycle =
-            self.lifecycle
-                .clone()
-                .update_lifecycle_after_sign(app_state, validated_by, request_id);
+    ) -> Result<Self, String> {
+        let new_life_cycle = self.lifecycle
+            .clone()
+            .update_lifecycle_after_sign(app_state, validated_by, request_id)?;
+            
         let sps_change_requests = self
             .allowed_sps
             .clone()
             .unwrap_or_default()
             .add_change_request(sps_change_request);
-        Self {
+            
+        let new_app = Self {
             lifecycle: new_life_cycle,
             allowed_sps: Some(sps_change_requests),
             ..self.clone()
-        }
+        };
+
+        new_app.validate()?;
+        Ok(new_app)
     }
 
     pub fn update_changing_sps_request(
@@ -212,6 +216,20 @@ impl file::ApplicationFile {
             ..self.clone()
         }
     }
+    pub fn validate(&self) -> Result<(), String> {
+        self.lifecycle.validate()?;
+
+        match self.lifecycle.state {
+            AppState::ReadyToSign | AppState::StartSignDatacap | AppState::Granted => {
+                if self.allocation.0.is_empty() {
+                    return Err("Allocations are required for this state".to_string());
+                }
+            }
+            _ => {}
+        }
+
+        Ok(())
+    }
 }
 
 impl std::str::FromStr for file::ApplicationFile {
diff --git a/fplus-lib/src/core/mod.rs b/fplus-lib/src/core/mod.rs
index 7245b42..39e200a 100644
--- a/fplus-lib/src/core/mod.rs
+++ b/fplus-lib/src/core/mod.rs
@@ -4463,6 +4463,17 @@ _The initial issue can be edited in order to solve the request of the verifier.
 
         Ok(application_file)
     }
+
+    pub fn reached_total_datacap(self) -> Self {
+        let empty = "".to_string();
+
+        LifeCycle {
+            is_active: false,
+            updated_at: Utc::now().to_string(),
+            active_request: Some(empty),
+            ..self
+        }
+    }
 }
 
 #[derive(Serialize, Deserialize, Debug)]