diff --git a/src/controllers/product/group-controller.ts b/src/controllers/product/group-controller.ts
index dd4873f..fb6ace0 100644
--- a/src/controllers/product/group-controller.ts
+++ b/src/controllers/product/group-controller.ts
@@ -63,27 +63,30 @@ export class ProductGroup extends Controller {
 
   @Post()
   async createProductGroup(@Request() req: RequestWithUser, @Body() body: ProductGroupCreate) {
-    const record = await prisma.$transaction(async (tx) => {
-      const last = await tx.runningNo.upsert({
-        where: {
-          key: `PRODGRP`,
-        },
-        create: {
-          key: `PRODGRP`,
-          value: 1,
-        },
-        update: { value: { increment: 1 } },
-      });
+    const record = await prisma.$transaction(
+      async (tx) => {
+        const last = await tx.runningNo.upsert({
+          where: {
+            key: `PRODGRP`,
+          },
+          create: {
+            key: `PRODGRP`,
+            value: 1,
+          },
+          update: { value: { increment: 1 } },
+        });
 
-      return await tx.productGroup.create({
-        data: {
-          ...body,
-          code: `G${last.value.toString().padStart(2, "0")}`,
-          createdBy: req.user.name,
-          updateBy: req.user.name,
-        },
-      });
-    });
+        return await tx.productGroup.create({
+          data: {
+            ...body,
+            code: `G${last.value.toString().padStart(2, "0")}`,
+            createdBy: req.user.name,
+            updateBy: req.user.name,
+          },
+        });
+      },
+      { isolationLevel: Prisma.TransactionIsolationLevel.Serializable },
+    );
 
     this.setStatus(HttpStatus.CREATED);
 
diff --git a/src/controllers/product/type-controller.ts b/src/controllers/product/type-controller.ts
index d27d834..c450cd5 100644
--- a/src/controllers/product/type-controller.ts
+++ b/src/controllers/product/type-controller.ts
@@ -77,27 +77,30 @@ export class ProductType extends Controller {
       );
     }
 
-    const record = await prisma.$transaction(async (tx) => {
-      const last = await tx.runningNo.upsert({
-        where: {
-          key: `PRODTYP_T${productGroup.code}`,
-        },
-        create: {
-          key: `PRODTYP_T${productGroup.code}`,
-          value: 1,
-        },
-        update: { value: { increment: 1 } },
-      });
+    const record = await prisma.$transaction(
+      async (tx) => {
+        const last = await tx.runningNo.upsert({
+          where: {
+            key: `PRODTYP_T${productGroup.code}`,
+          },
+          create: {
+            key: `PRODTYP_T${productGroup.code}`,
+            value: 1,
+          },
+          update: { value: { increment: 1 } },
+        });
 
-      return await tx.productType.create({
-        data: {
-          ...body,
-          code: `T${productGroup.code}${last.value.toString().padStart(2, "0")}`,
-          createdBy: req.user.name,
-          updateBy: req.user.name,
-        },
-      });
-    });
+        return await tx.productType.create({
+          data: {
+            ...body,
+            code: `T${productGroup.code}${last.value.toString().padStart(2, "0")}`,
+            createdBy: req.user.name,
+            updateBy: req.user.name,
+          },
+        });
+      },
+      { isolationLevel: Prisma.TransactionIsolationLevel.Serializable },
+    );
 
     this.setStatus(HttpStatus.CREATED);