diff --git a/packages/schema/src/plugins/enhancer/enhance/index.ts b/packages/schema/src/plugins/enhancer/enhance/index.ts
index ff2e00b6a..34cf26640 100644
--- a/packages/schema/src/plugins/enhancer/enhance/index.ts
+++ b/packages/schema/src/plugins/enhancer/enhance/index.ts
@@ -515,15 +515,11 @@ export function enhance(prisma: any, context?: EnhancementContext<${authTypePara
         return source;
     }
 
-    private removeCreateFromDelegateInput(
-        typeAlias: TypeAliasDeclaration,
-        delegateModels: DelegateInfo,
-        source: string
-    ) {
+    private removeCreateFromDelegateInput(typeAlias: TypeAliasDeclaration, delegateInfo: DelegateInfo, source: string) {
         // remove create/connectOrCreate/upsert fields from delegate's input types because
         // delegate models cannot be created directly
         const typeName = typeAlias.getName();
-        const delegateModelNames = delegateModels.map(([delegate]) => delegate.name);
+        const delegateModelNames = delegateInfo.map(([delegate]) => delegate.name);
         const delegateCreateUpdateInputRegex = new RegExp(
             `^(${delegateModelNames.join('|')})(Unchecked)?(Create|Update).*Input$`
         );
@@ -538,17 +534,24 @@ export function enhance(prisma: any, context?: EnhancementContext<${authTypePara
         return source;
     }
 
-    private readonly ModelCreateUpdateInputRegex = /(\S+)(Unchecked)?(Create|Update).*Input/;
-
     private removeDiscriminatorFromConcreteInput(
         typeAlias: TypeAliasDeclaration,
-        _delegateInfo: DelegateInfo,
+        delegateInfo: DelegateInfo,
         source: string
     ) {
         // remove discriminator field from the create/update input because discriminator cannot be set directly
         const typeName = typeAlias.getName();
 
-        const match = typeName.match(this.ModelCreateUpdateInputRegex);
+        const delegateModelNames = delegateInfo.map(([delegate]) => delegate.name);
+        const concreteModelNames = delegateInfo
+            .map(([_, concretes]) => concretes.flatMap((c) => c.name))
+            .flatMap((name) => name);
+        const allModelNames = [...new Set([...delegateModelNames, ...concreteModelNames])];
+        const concreteCreateUpdateInputRegex = new RegExp(
+            `^(${allModelNames.join('|')})(Unchecked)?(Create|Update).*Input$`
+        );
+
+        const match = typeName.match(concreteCreateUpdateInputRegex);
         if (match) {
             const modelName = match[1];
             const dataModel = this.model.declarations.find(
diff --git a/tests/regression/tests/issue-1763.test.ts b/tests/regression/tests/issue-1763.test.ts
new file mode 100644
index 000000000..d5ea1d401
--- /dev/null
+++ b/tests/regression/tests/issue-1763.test.ts
@@ -0,0 +1,47 @@
+import { loadSchema } from '@zenstackhq/testtools';
+
+describe('issue 1763', () => {
+    it('regression', async () => {
+        await loadSchema(
+            `
+            model Post {
+                id   Int    @id @default(autoincrement())
+                name String
+
+                type String
+                @@delegate(type)
+
+                // full access by author
+                @@allow('all', true)
+            }
+
+            model ConcretePost extends Post {
+                age Int
+            }
+            `,
+            {
+                compile: true,
+                extraSourceFiles: [
+                    {
+                        name: 'main.ts',
+                        content: `
+import { PrismaClient as Prisma } from '@prisma/client';
+import { enhance } from '@zenstackhq/runtime';
+
+async function test() {
+    const prisma = new Prisma();
+    const db = enhance(prisma);
+    await db.concretePost.create({
+        data: {
+            id: 5,
+            name: 'a name',
+            age: 20,
+        },
+    });
+}                        `,
+                    },
+                ],
+            }
+        );
+    });
+});