Minor change: Alert to msgprint (#8966)

* Minor change: Alert to msgprint

* msgprint to frappe.msgprint
diff --git a/erpnext/stock/doctype/material_request/material_request.js b/erpnext/stock/doctype/material_request/material_request.js
index 58c16e1..b386a47 100644
--- a/erpnext/stock/doctype/material_request/material_request.js
+++ b/erpnext/stock/doctype/material_request/material_request.js
@@ -33,7 +33,7 @@
 	"qty": function(frm, doctype, name) {
 			var d = locals[doctype][name];
 			if (flt(d.qty) < flt(d.min_order_qty)) {
-				alert(__("Warning: Material Requested Qty is less than Minimum Order Qty"));
+				frappe.msgprint(__("Warning: Material Requested Qty is less than Minimum Order Qty"));
 			}
 		}
 	}