change the way to detect if new simulation API is used or not.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@36859 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/tests/testInvoice.py

@@ -3456,7 +3456,8 @@ class TestSaleInvoice(TestSaleInvoiceMixin, TestInvoice, ERP5TypeTestCase):
           invoice_line.getDeliveryRelatedValue(portal_type='Simulation Movement'
               ).getQuantity())
 
-    if self.portal._getOb('portal_solvers', None) is not None:
+    if invoice_line.getDeliveryRelatedValue().getParentValue().getSpecialiseId() == \
+        'new_invoice_simulation_rule':
       # With new simulation solvers, changes on simulation movements will
       # not backtrack.
       pass