Fix some tests in testTradeModelLinePurchase

Contrary to Sale Invoice Transactions, Purchase Invoice Transactions
are built when Purchase Packing Lists are stopped.

git-svn-id: https://svn.erp5.org/repos/public/erp5/sandbox/amount_generator@38392 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/tests/testTradeModelLine.py

@@ -271,6 +271,7 @@ class TestTradeModelLine(TestTradeModelLineMixin):
     self.tic()
 
     packing_list.start()
+    packing_list.stop()
     transaction.commit()
     self.tic()
 
@@ -278,7 +279,6 @@ class TestTradeModelLine(TestTradeModelLineMixin):
       portal_type=self.invoice_portal_type)
     self.assertEqual(5, len(invoice))
 
-    packing_list.stop()
     packing_list.deliver()
     transaction.commit()
     self.tic()