diff --git a/packages/runtime/src/enhancements/node/delegate.ts b/packages/runtime/src/enhancements/node/delegate.ts
index 06c1526e5..59bc79793 100644
--- a/packages/runtime/src/enhancements/node/delegate.ts
+++ b/packages/runtime/src/enhancements/node/delegate.ts
@@ -1106,7 +1106,18 @@ export class DelegateProxyHandler extends DefaultPrismaProxyHandler {
         const entities = await db[model].findMany(findArgs);
 
         // recursively delete base entities (they all have the same id values)
-        await Promise.all(entities.map((entity) => this.doDelete(db, model, { where: entity })));
+
+        await Promise.all(
+            entities.map((entity) => {
+                let deleteFilter = entity;
+                if (Object.keys(deleteFilter).length > 1) {
+                    // if the model has compound id fields, we need to compose a compound key filter,
+                    // otherwise calling Prisma's `delete` won't work
+                    deleteFilter = this.queryUtils.composeCompoundUniqueField(model, deleteFilter);
+                }
+                return this.doDelete(db, model, { where: deleteFilter });
+            })
+        );
 
         return { count: entities.length };
     }
@@ -1114,7 +1125,13 @@ export class DelegateProxyHandler extends DefaultPrismaProxyHandler {
     private async deleteBaseRecursively(db: CrudContract, model: string, idValues: any) {
         let base = this.getBaseModel(model);
         while (base) {
-            await db[base.name].delete({ where: idValues });
+            let deleteFilter = idValues;
+            if (Object.keys(idValues).length > 1) {
+                // if the model has compound id fields, we need to compose a compound key filter,
+                // otherwise calling Prisma's `delete` won't work
+                deleteFilter = this.queryUtils.composeCompoundUniqueField(base.name, deleteFilter);
+            }
+            await db[base.name].delete({ where: deleteFilter });
             base = this.getBaseModel(base.name);
         }
     }
diff --git a/tests/regression/tests/issue-1998.test.ts b/tests/regression/tests/issue-1998.test.ts
new file mode 100644
index 000000000..a2810dfea
--- /dev/null
+++ b/tests/regression/tests/issue-1998.test.ts
@@ -0,0 +1,59 @@
+import { loadSchema } from '@zenstackhq/testtools';
+
+describe('issue 1998', () => {
+    it('regression', async () => {
+        const { enhance } = await loadSchema(
+            `
+            model Entity {
+                id String @id
+                type String
+                updatable Boolean
+                children Relation[] @relation("children")
+                parents  Relation[] @relation("parents")
+
+                @@delegate(type)                
+                @@allow('create,read', true)
+                @@allow('update', updatable)
+            }
+
+            model A extends Entity {}
+
+            model B extends Entity {}
+
+            model Relation {
+                parent   Entity @relation("children", fields: [parentId], references: [id])
+                parentId String
+                child    Entity @relation("parents", fields: [childId], references: [id])
+                childId  String
+
+                @@allow('create', true)
+                @@allow('read', check(parent, 'read') && check(child, 'read'))
+                @@allow('delete', check(parent, 'update') && check(child, 'update'))
+
+                @@id([parentId, childId])
+            }            
+            `
+        );
+
+        const db = enhance();
+
+        await db.a.create({ data: { id: '1', updatable: true } });
+        await db.b.create({ data: { id: '2', updatable: true } });
+        await db.relation.create({ data: { parentId: '1', childId: '2' } });
+
+        await expect(
+            db.relation.deleteMany({
+                where: { parentId: '1', childId: '2' },
+            })
+        ).resolves.toEqual({ count: 1 });
+
+        await db.a.create({ data: { id: '3', updatable: false } });
+        await db.b.create({ data: { id: '4', updatable: false } });
+        await db.relation.create({ data: { parentId: '3', childId: '4' } });
+        await expect(
+            db.relation.deleteMany({
+                where: { parentId: '3', childId: '4' },
+            })
+        ).resolves.toEqual({ count: 0 });
+    });
+});