diff --git a/erpnext/manufacturing/doctype/work_order/work_order.py b/erpnext/manufacturing/doctype/work_order/work_order.py
index 8ec80ad..7eb40ec 100644
--- a/erpnext/manufacturing/doctype/work_order/work_order.py
+++ b/erpnext/manufacturing/doctype/work_order/work_order.py
@@ -647,12 +647,12 @@
 		if self.production_plan and self.production_plan_item:
 			qty_dict = frappe.db.get_value("Production Plan Item", self.production_plan_item, ["planned_qty", "ordered_qty"], as_dict=1)
 
-			allowance_qty =flt(frappe.db.get_single_value("Manufacturing Settings",
+			allowance_qty = flt(frappe.db.get_single_value("Manufacturing Settings",
 			"overproduction_percentage_for_work_order"))/100 * qty_dict.get("planned_qty", 0)
 
 			max_qty = qty_dict.get("planned_qty", 0) + allowance_qty - qty_dict.get("ordered_qty", 0)
 
-			if max_qty < 1:
+			if not max_qty > 0:
 				frappe.throw(_("Cannot produce more item for {0}")
 				.format(self.production_item), OverProductionError)
 			elif self.qty > max_qty: