test: add regression test for zero quantity Blanket Order

(cherry picked from commit d80b0f67cc)

erpnext/manufacturing/doctype/blanket_order/blanket_order.py

@@ -120,8 +120,8 @@ class BlanketOrder(Document):
 
 	def validate_item_qty(self):
 		for d in self.items:
-			if flt(d.qty) < 0:
-				frappe.throw(_("Row {0}: Quantity cannot be negative.").format(d.idx))
+			if flt(d.qty) <= 0:
+				frappe.throw(_("Row {0}: Quantity must be greater than zero.").format(d.idx))
 
 
 @frappe.whitelist()

erpnext/manufacturing/doctype/blanket_order/test_blanket_order.py

@@ -113,6 +113,26 @@ class TestBlanketOrder(FrappeTestCase):
 		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)