Modify the transition to do checking of price currency between bank_account and transaction, it must be the same. (fix bug number: 1242, the corresponding unit test is commited in the revision number 34386)

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@34387 20353a03-c40f-0410-a6d1-a30d3c3de9de