diff --git a/src/controllers/branch-controller.ts b/src/controllers/branch-controller.ts
index f2ff526..06ad512 100644
--- a/src/controllers/branch-controller.ts
+++ b/src/controllers/branch-controller.ts
@@ -310,10 +310,10 @@ export class BranchController extends Controller {
       async (tx) => {
         const last = await tx.runningNo.upsert({
           where: {
-            key: `MAIN_BRANCH_${code}`,
+            key: `MAIN_BRANCH_${code.toLocaleUpperCase()}`,
           },
           create: {
-            key: `MAIN_BRANCH_${code}`,
+            key: `MAIN_BRANCH_${code.toLocaleUpperCase()}`,
             value: 1,
           },
           update: { value: { increment: 1 } },