diff --git a/src/components/purchase/PurchaseSchema.jsx b/src/components/purchase/PurchaseSchema.jsx
index 9322bdc5..2656fa58 100644
--- a/src/components/purchase/PurchaseSchema.jsx
+++ b/src/components/purchase/PurchaseSchema.jsx
@@ -180,7 +180,12 @@ export const DeliveryChallanSchema = z.object({
   invoiceAttachmentTypeId: z.string().nullable(),
   deliveryChallanDate: z.string().min(1, { message: "Deliver date required" }),
   description: z.string().min(1, { message: "Description required" }),
-  attachment: z.object(SingleAttachmentSchema.shape).nullable(),
+ attachment: z.any().refine(
+    (val) => val && typeof val === "object" && !!val.base64Data,
+    {
+      message: "Please upload document",
+    }
+  ),
 });
 
 export const DeliveryChallanDefaultValue = {