diff --git a/src/controllers/04-service-controller.ts b/src/controllers/04-service-controller.ts
index 0934238..6c0cf4d 100644
--- a/src/controllers/04-service-controller.ts
+++ b/src/controllers/04-service-controller.ts
@@ -308,6 +308,18 @@ export class ServiceController extends Controller {
 
     await permissionCheck(req.user, productGroup.registeredBranch);
 
+    if (body.installments && body.work) {
+      for (let i = 0; i < body.installments; i++) {
+        if (!body.work.some((w) => w.product.some((p) => p.installmentNo === i + 1))) {
+          throw new HttpError(
+            HttpStatus.BAD_REQUEST,
+            "Installments validate failed.",
+            "installmentsValidateFailed",
+          );
+        }
+      }
+    }
+
     const record = await prisma.$transaction(
       async (tx) => {
         const branch = productGroup.registeredBranch;
@@ -419,6 +431,18 @@ export class ServiceController extends Controller {
       await permissionCheck(req.user, productGroup.registeredBranch);
     }
 
+    if (body.installments && body.work) {
+      for (let i = 0; i < body.installments; i++) {
+        if (!body.work.some((w) => w.product.some((p) => p.installmentNo === i + 1))) {
+          throw new HttpError(
+            HttpStatus.BAD_REQUEST,
+            "Installments validate failed.",
+            "installmentsValidateFailed",
+          );
+        }
+      }
+    }
+
     const record = await prisma.$transaction(async (tx) => {
       if (payload.workflowId === "") payload.workflowId = undefined;