diff --git a/erpnext/controllers/accounts_controller.py b/erpnext/controllers/accounts_controller.py
index 86ceb2e4abf..56ae25e92b3 100644
--- a/erpnext/controllers/accounts_controller.py
+++ b/erpnext/controllers/accounts_controller.py
@@ -1073,6 +1073,10 @@ def update_child_qty_rate(parent_doctype, trans_items, parent_doctype_name):
 	data = json.loads(trans_items)
 	for d in data:
 		child_item = frappe.get_doc(parent_doctype + ' Item', d.get("docname"))
+
+		if flt(d.get("qty")) < child_item.delivered_qty:
+			frappe.throw(_("Cannot set quantity less than delivered quantity"))
+
 		child_item.qty = flt(d.get("qty"))
 
 		if child_item.billed_amt > (flt(d.get("rate")) * flt(d.get("qty"))):