diff --git a/package.json b/package.json
index 7127fc1b8..d61f79174 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "zenstack-monorepo",
-    "version": "1.10.3",
+    "version": "1.11.0",
     "description": "",
     "scripts": {
         "build": "pnpm -r build",
diff --git a/packages/ide/jetbrains/build.gradle.kts b/packages/ide/jetbrains/build.gradle.kts
index 702173ecc..23dc11e99 100644
--- a/packages/ide/jetbrains/build.gradle.kts
+++ b/packages/ide/jetbrains/build.gradle.kts
@@ -9,7 +9,7 @@ plugins {
 }
 
 group = "dev.zenstack"
-version = "1.10.3"
+version = "1.11.0"
 
 repositories {
     mavenCentral()
diff --git a/packages/ide/jetbrains/package.json b/packages/ide/jetbrains/package.json
index 1243423e7..09476b216 100644
--- a/packages/ide/jetbrains/package.json
+++ b/packages/ide/jetbrains/package.json
@@ -1,6 +1,6 @@
 {
     "name": "jetbrains",
-    "version": "1.10.3",
+    "version": "1.11.0",
     "displayName": "ZenStack JetBrains IDE Plugin",
     "description": "ZenStack JetBrains IDE plugin",
     "homepage": "https://zenstack.dev",
diff --git a/packages/language/package.json b/packages/language/package.json
index a07cd6772..50758ce23 100644
--- a/packages/language/package.json
+++ b/packages/language/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@zenstackhq/language",
-    "version": "1.10.3",
+    "version": "1.11.0",
     "displayName": "ZenStack modeling language compiler",
     "description": "ZenStack modeling language compiler",
     "homepage": "https://zenstack.dev",
diff --git a/packages/misc/redwood/package.json b/packages/misc/redwood/package.json
index 300daaced..d95ef1925 100644
--- a/packages/misc/redwood/package.json
+++ b/packages/misc/redwood/package.json
@@ -1,7 +1,7 @@
 {
     "name": "@zenstackhq/redwood",
     "displayName": "ZenStack RedwoodJS Integration",
-    "version": "1.10.3",
+    "version": "1.11.0",
     "description": "CLI and runtime for integrating ZenStack with RedwoodJS projects.",
     "repository": {
         "type": "git",
diff --git a/packages/plugins/openapi/package.json b/packages/plugins/openapi/package.json
index d0f39b473..3db67dead 100644
--- a/packages/plugins/openapi/package.json
+++ b/packages/plugins/openapi/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@zenstackhq/openapi",
   "displayName": "ZenStack Plugin and Runtime for OpenAPI",
-  "version": "1.10.3",
+  "version": "1.11.0",
   "description": "ZenStack plugin and runtime supporting OpenAPI",
   "main": "index.js",
   "repository": {
diff --git a/packages/plugins/swr/package.json b/packages/plugins/swr/package.json
index 1bd780195..0d1fb7147 100644
--- a/packages/plugins/swr/package.json
+++ b/packages/plugins/swr/package.json
@@ -1,7 +1,7 @@
 {
     "name": "@zenstackhq/swr",
     "displayName": "ZenStack plugin for generating SWR hooks",
-    "version": "1.10.3",
+    "version": "1.11.0",
     "description": "ZenStack plugin for generating SWR hooks",
     "main": "index.js",
     "repository": {
diff --git a/packages/plugins/tanstack-query/package.json b/packages/plugins/tanstack-query/package.json
index 2cd3e1161..8d034e8f4 100644
--- a/packages/plugins/tanstack-query/package.json
+++ b/packages/plugins/tanstack-query/package.json
@@ -1,7 +1,7 @@
 {
     "name": "@zenstackhq/tanstack-query",
     "displayName": "ZenStack plugin for generating tanstack-query hooks",
-    "version": "1.10.3",
+    "version": "1.11.0",
     "description": "ZenStack plugin for generating tanstack-query hooks",
     "main": "index.js",
     "exports": {
diff --git a/packages/plugins/trpc/package.json b/packages/plugins/trpc/package.json
index bf8107afd..ad76965c2 100644
--- a/packages/plugins/trpc/package.json
+++ b/packages/plugins/trpc/package.json
@@ -1,7 +1,7 @@
 {
     "name": "@zenstackhq/trpc",
     "displayName": "ZenStack plugin for tRPC",
-    "version": "1.10.3",
+    "version": "1.11.0",
     "description": "ZenStack plugin for tRPC",
     "main": "index.js",
     "repository": {
diff --git a/packages/runtime/package.json b/packages/runtime/package.json
index 160341df6..5665262c1 100644
--- a/packages/runtime/package.json
+++ b/packages/runtime/package.json
@@ -1,7 +1,7 @@
 {
     "name": "@zenstackhq/runtime",
     "displayName": "ZenStack Runtime Library",
-    "version": "1.10.3",
+    "version": "1.11.0",
     "description": "Runtime of ZenStack for both client-side and server-side environments.",
     "repository": {
         "type": "git",
diff --git a/packages/schema/package.json b/packages/schema/package.json
index bae642f1a..249389e68 100644
--- a/packages/schema/package.json
+++ b/packages/schema/package.json
@@ -3,7 +3,7 @@
     "publisher": "zenstack",
     "displayName": "ZenStack Language Tools",
     "description": "Build scalable web apps with minimum code by defining authorization and validation rules inside the data schema that closer to the database",
-    "version": "1.10.3",
+    "version": "1.11.0",
     "author": {
         "name": "ZenStack Team"
     },
diff --git a/packages/schema/src/utils/ast-utils.ts b/packages/schema/src/utils/ast-utils.ts
index 348752fae..c752c837d 100644
--- a/packages/schema/src/utils/ast-utils.ts
+++ b/packages/schema/src/utils/ast-utils.ts
@@ -18,6 +18,8 @@ import {
 import { isFromStdlib } from '@zenstackhq/sdk';
 import { AstNode, getDocument, LangiumDocuments, Mutable } from 'langium';
 import { URI, Utils } from 'vscode-uri';
+import { findNodeModulesFile } from './pkg-utils';
+import {isAbsolute} from 'node:path'
 
 export function extractDataModelsWithAllowRules(model: Model): DataModel[] {
     return model.declarations.filter(
@@ -94,15 +96,21 @@ export function getDataModelFieldReference(expr: Expression): DataModelField | u
 }
 
 export function resolveImportUri(imp: ModelImport): URI | undefined {
-    if (imp.path === undefined || imp.path.length === 0) {
-        return undefined;
+    if (!imp.path) return undefined; // This will return true if imp.path is undefined, null, or an empty string ("").
+
+    if (!imp.path.endsWith('.zmodel')) {
+        imp.path += '.zmodel';
     }
-    const dirUri = Utils.dirname(getDocument(imp).uri);
-    let grammarPath = imp.path;
-    if (!grammarPath.endsWith('.zmodel')) {
-        grammarPath += '.zmodel';
+
+    if (
+        !imp.path.startsWith('.') // Respect relative paths
+        && !isAbsolute(imp.path) // Respect Absolute paths
+    ) {
+        imp.path = findNodeModulesFile(imp.path) ?? imp.path;
     }
-    return Utils.resolvePath(dirUri, grammarPath);
+
+    const dirUri = Utils.dirname(getDocument(imp).uri);
+    return Utils.resolvePath(dirUri, imp.path);
 }
 
 export function resolveTransitiveImports(documents: LangiumDocuments, model: Model): Model[] {
diff --git a/packages/schema/src/utils/pkg-utils.ts b/packages/schema/src/utils/pkg-utils.ts
index ce41dac34..99593dcd3 100644
--- a/packages/schema/src/utils/pkg-utils.ts
+++ b/packages/schema/src/utils/pkg-utils.ts
@@ -5,8 +5,8 @@ import { execSync } from './exec-utils';
 export type PackageManagers = 'npm' | 'yarn' | 'pnpm';
 
 /**
- * A type named FindUp that takes a type parameter e which extends boolean. 
- * If e extends true, it returns a union type of string[] or undefined. 
+ * A type named FindUp that takes a type parameter e which extends boolean.
+ * If e extends true, it returns a union type of string[] or undefined.
  * If e does not extend true, it returns a union type of string or undefined.
  *
  * @export
@@ -14,9 +14,9 @@ export type PackageManagers = 'npm' | 'yarn' | 'pnpm';
  */
 export type FindUp<e extends boolean> = e extends true ? string[] | undefined : string | undefined
 /**
- * Find and return file paths by searching parent directories based on the given names list and current working directory (cwd) path. 
- * Optionally return a single path or multiple paths. 
- * If multiple allowed, return all paths found. 
+ * Find and return file paths by searching parent directories based on the given names list and current working directory (cwd) path.
+ * Optionally return a single path or multiple paths.
+ * If multiple allowed, return all paths found.
  * If no paths are found, return undefined.
  *
  * @export
@@ -37,6 +37,30 @@ export function findUp<e extends boolean = false>(names: string[], cwd: string =
     return findUp(names, up, multiple, result);
 }
 
+
+/**
+ * Find a Node module/file given its name in a specific directory, with a fallback to the current working directory.
+ * If the name is empty, return undefined.
+ * Try to resolve the module/file using require.resolve with the specified directory as the starting point.
+ * Return the resolved path if successful, otherwise return undefined.
+ *
+ * @export
+ * @param {string} name The name of the module/file to find
+ * @param {string} [cwd=process.cwd()]
+ * @returns {*} Finds a specified module or file using require.resolve starting from a specified directory path, or the current working directory if not provided.
+ */
+export function findNodeModulesFile(name: string, cwd: string = process.cwd()) {
+    if (!name) return undefined;
+    try {
+        // Use require.resolve to find the module/file. The paths option allows specifying the directory to start from.
+        const resolvedPath = require.resolve(name, { paths: [cwd] })
+        return resolvedPath
+    } catch (error) {
+        // If require.resolve fails to find the module/file, it will throw an error.
+        return undefined
+    }
+}
+
 function getPackageManager(projectPath = '.'): PackageManagers {
     const lockFile = findUp(['yarn.lock', 'pnpm-lock.yaml', 'package-lock.json'], projectPath);
 
@@ -106,7 +130,7 @@ export function ensurePackage(
 }
 
 /**
- * A function that searches for the nearest package.json file starting from the provided search path or the current working directory if no search path is provided. 
+ * A function that searches for the nearest package.json file starting from the provided search path or the current working directory if no search path is provided.
  * It iterates through the directory structure going one level up at a time until it finds a package.json file. If no package.json file is found, it returns undefined.
  * @deprecated Use findUp instead @see findUp
  */
diff --git a/packages/sdk/package.json b/packages/sdk/package.json
index 651429ef8..110fec6c0 100644
--- a/packages/sdk/package.json
+++ b/packages/sdk/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@zenstackhq/sdk",
-    "version": "1.10.3",
+    "version": "1.11.0",
     "description": "ZenStack plugin development SDK",
     "main": "index.js",
     "scripts": {
diff --git a/packages/sdk/src/utils.ts b/packages/sdk/src/utils.ts
index d32962f11..a32abc068 100644
--- a/packages/sdk/src/utils.ts
+++ b/packages/sdk/src/utils.ts
@@ -218,11 +218,14 @@ export function isIdField(field: DataModelField) {
         return true;
     }
 
+    // NOTE: we have to use name to match fields because the fields
+    // may be inherited from an abstract base and have cloned identities
+
     const model = field.$container as DataModel;
 
     // model-level @@id attribute with a list of fields
     const modelLevelIds = getModelIdFields(model);
-    if (modelLevelIds.includes(field)) {
+    if (modelLevelIds.map((f) => f.name).includes(field.name)) {
         return true;
     }
 
@@ -234,12 +237,12 @@ export function isIdField(field: DataModelField) {
     // then, the first field with @unique can be used as id
     const firstUniqueField = model.fields.find((f) => hasAttribute(f, '@unique'));
     if (firstUniqueField) {
-        return firstUniqueField === field;
+        return firstUniqueField.name === field.name;
     }
 
     // last, the first model level @@unique can be used as id
     const modelLevelUnique = getModelUniqueFields(model);
-    if (modelLevelUnique.includes(field)) {
+    if (modelLevelUnique.map((f) => f.name).includes(field.name)) {
         return true;
     }
 
diff --git a/packages/server/package.json b/packages/server/package.json
index 1936946b2..ea60177a5 100644
--- a/packages/server/package.json
+++ b/packages/server/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@zenstackhq/server",
-    "version": "1.10.3",
+    "version": "1.11.0",
     "displayName": "ZenStack Server-side Adapters",
     "description": "ZenStack server-side adapters",
     "homepage": "https://zenstack.dev",
diff --git a/packages/testtools/package.json b/packages/testtools/package.json
index d8f7ce067..97e842f00 100644
--- a/packages/testtools/package.json
+++ b/packages/testtools/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@zenstackhq/testtools",
-  "version": "1.10.3",
+  "version": "1.11.0",
   "description": "ZenStack Test Tools",
   "main": "index.js",
   "private": true,
diff --git a/tests/integration/tests/regression/issue-1129.test.ts b/tests/integration/tests/regression/issue-1129.test.ts
new file mode 100644
index 000000000..49198a5cb
--- /dev/null
+++ b/tests/integration/tests/regression/issue-1129.test.ts
@@ -0,0 +1,87 @@
+import { createPostgresDb, dropPostgresDb, loadSchema } from '@zenstackhq/testtools';
+
+describe('Regression for issue 1129', () => {
+    it('regression', async () => {
+        let prisma;
+        const dbUrl = await createPostgresDb('regression-issue-1129');
+
+        try {
+            const r = await loadSchema(
+                `
+            model Relation1 {
+              id String @id @default(cuid())
+              field1 String
+              concrete Concrete[]
+              @@allow('all', true)
+            }
+            
+            model Relation2 {
+              id String @id @default(cuid())
+              field2 String
+              concrete Concrete[]
+              @@allow('all', true)
+            }
+            
+            abstract model WithRelation1 {
+              relation1Id String
+              relation1 Relation1 @relation(fields: [relation1Id], references: [id])
+            }
+            abstract model WithRelation2 {
+              relation2Id String
+              relation2 Relation2 @relation(fields: [relation2Id], references: [id])
+            }
+            
+            model Concrete extends WithRelation1, WithRelation2 {
+              concreteField String
+              @@id([relation1Id, relation2Id])
+              @@allow('all', true)
+            }
+            `,
+                { provider: 'postgresql', dbUrl }
+            );
+
+            prisma = r.prisma;
+            const db = r.enhance();
+
+            await db.$transaction(async (tx: any) => {
+                await tx.relation2.createMany({
+                    data: [
+                        {
+                            id: 'relation2Id1',
+                            field2: 'field2Value1',
+                        },
+                        {
+                            id: 'relation2Id2',
+                            field2: 'field2Value2',
+                        },
+                    ],
+                });
+
+                await tx.relation1.create({
+                    data: {
+                        field1: 'field1Value',
+                        concrete: {
+                            createMany: {
+                                data: [
+                                    {
+                                        concreteField: 'concreteFieldValue1',
+                                        relation2Id: 'relation2Id1',
+                                    },
+                                    {
+                                        concreteField: 'concreteFieldValue2',
+                                        relation2Id: 'relation2Id2',
+                                    },
+                                ],
+                            },
+                        },
+                    },
+                });
+            });
+        } finally {
+            if (prisma) {
+                await prisma.$disconnect();
+            }
+            await dropPostgresDb('regression-issue-1129');
+        }
+    });
+});