diff --git a/erpnext/controllers/accounts_controller.py b/erpnext/controllers/accounts_controller.py
index 6be282d0a3d..23849c254e0 100644
--- a/erpnext/controllers/accounts_controller.py
+++ b/erpnext/controllers/accounts_controller.py
@@ -1124,10 +1124,10 @@ def update_child_qty_rate(parent_doctype, trans_items, parent_doctype_name, chil
 		else:
 			child_item = frappe.get_doc(parent_doctype + ' Item', d.get("docname"))
 
-		if parent_doctype == "Sales Order" and flt(d.get("qty")) < child_item.delivered_qty:
+		if parent_doctype == "Sales Order" and flt(d.get("qty")) < flt(child_item.delivered_qty):
 			frappe.throw(_("Cannot set quantity less than delivered quantity"))
 
-		if parent_doctype == "Purchase Order" and flt(d.get("qty")) < child_item.received_qty:
+		if parent_doctype == "Purchase Order" and flt(d.get("qty")) < flt(child_item.received_qty):
 			frappe.throw(_("Cannot set quantity less than received quantity"))
 
 		child_item.qty = flt(d.get("qty"))