test: add regression test for zero quantity Blanket Order

erpnext/manufacturing/doctype/blanket_order/test_blanket_order.py

@@ -162,6 +162,26 @@ class TestBlanketOrder(ERPNextTestSuite):
 		bo = make_blanket_order(blanket_order_type="Purchasing", supplier=supplier, item_code=item_code)
 		self.assertEqual(bo.items[0].party_item_code, "SUPP-PART-1")
 
+	def test_blanket_order_zero_quantity(self):
+		bo = frappe.new_doc("Blanket Order")
+		bo.blanket_order_type = "Selling"
+		bo.company = "_Test Company"
+		bo.customer = "_Test Customer"
+		bo.from_date = today()
+		bo.to_date = add_months(today(), 12)
+
+		bo.append(
+			"items",
+			{
+				"item_code": "_Test Item",
+				"qty": 0,
+				"rate": 100,
+			},
+		)
+
+		with self.assertRaises(frappe.ValidationError):
+			bo.insert()
+
 
 def make_blanket_order(**args):
 	args = frappe._dict(args)