diff --git a/src/controllers/04-service-controller.ts b/src/controllers/04-service-controller.ts
index b76c110..80b5f2b 100644
--- a/src/controllers/04-service-controller.ts
+++ b/src/controllers/04-service-controller.ts
@@ -412,11 +412,14 @@ export class ServiceController extends Controller {
                 order: wIdx + 1,
                 attributes: w.attributes,
                 productOnWork: {
-                  create: w.product.map((p, pIdx) => ({
-                    productId: p.id,
-                    installmentNo: p.installmentNo,
-                    order: pIdx + 1,
-                  })),
+                  createMany: {
+                    data: w.product.map((p, pIdx) => ({
+                      productId: p.id,
+                      installmentNo: p.installmentNo,
+                      order: pIdx + 1,
+                    })),
+                    skipDuplicates: true,
+                  },
                 },
               },
               update: {
@@ -424,6 +427,7 @@ export class ServiceController extends Controller {
                 order: wIdx + 1,
                 attributes: w.attributes,
                 productOnWork: {
+                  deleteMany: {},
                   create: w.product.map((p, pIdx) => ({
                     productId: p.id,
                     installmentNo: p.installmentNo,