Change InvoiceTransactionRule_asCellRange to use the IDs and not relative_url, because after a copy & paste, matrix range was not applicable (relative_url contains the full path of the object). This will require manual migration of existing documents.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@20475 20353a03-c40f-0410-a6d1-a30d3c3de9de