diff --git a/controllers/po.js b/controllers/po.js
index b4c8a20..fdfcb59 100644
--- a/controllers/po.js
+++ b/controllers/po.js
@@ -420,6 +420,16 @@ exports.createMIGOPOSAPold = (req, res) => {
 			}
 
 			const row = poDetail.data[0];
+			const existingMigo = String(row.migo || "").trim();
+			if (existingMigo && existingMigo !== "-" && existingMigo !== "000") {
+				apireshandler.success = false;
+				apireshandler.meta.code = 400;
+				apireshandler.meta.message =
+					"PO already has MIGO number: " + existingMigo;
+				poadapter.sendResponse(400, apireshandler, res);
+				return;
+			}
+
 			const idxpr = row.idxpr ?? 0;
 
 			const gm_code = "01";