diff --git a/App/lib/po-number.ts b/App/lib/po-number.ts
index 6a6c120..2ccbae3 100644
--- a/App/lib/po-number.ts
+++ b/App/lib/po-number.ts
@@ -18,7 +18,7 @@ function currentFY(): string {
   const year = now.getFullYear();
   const fyStart = month >= 4 ? year : year - 1;
   const fyEnd = fyStart + 1;
-  return `${String(fyStart).slice(-2)}${String(fyEnd).slice(-2)}`;
+  return `${fyStart}-${String(fyEnd).slice(-2)}`;
 }
 
 /** Find the next sequential PO ID (min 200) by scanning existing structured PO numbers. */