chore: fix flakiness test_sales_order_partial_advance_payment

(cherry picked from commit 4dff2c7)

erpnext/selling/doctype/sales_order/test_sales_order.py

@@ -1784,10 +1784,10 @@ def test_sales_order_partial_advance_payment(self):
 		si.submit()
 		pe.load_from_db()
 
-		self.assertEqual(pe.references[0].reference_name, si.name)
-		self.assertEqual(pe.references[0].allocated_amount, 200)
-		self.assertEqual(pe.references[1].reference_name, so.name)
-		self.assertEqual(pe.references[1].allocated_amount, 300)
+		self.assertEqual(pe.references[0].reference_name, so.name)
+		self.assertEqual(pe.references[0].allocated_amount, 300)
+		self.assertEqual(pe.references[1].reference_name, si.name)
+		self.assertEqual(pe.references[1].allocated_amount, 200)
 
 	def test_delivered_item_material_request(self):
 		"SO -> MR (Manufacture) -> WO. Test if WO Qty is updated in SO."