If the packing list is not frozen, it will be divergent, this is normal. In
this case the user will have to adopt prevision on the invoice or on the
packing list to solve this divergence.
Update the test to adopt prevision on the packing list and check that both
packing list and invoice are solved



git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@25519 20353a03-c40f-0410-a6d1-a30d3c3de9de