some fixes#214

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etsinko wants to merge 2 commits intoWilldooIT:version70from

etsinko:version70

Commits on Jan 15, 2015

fixed a TransactionRollbackError (closes WillowIT/Pentaho-reports-for-OpenERP#153)
etsinko
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Commits on Jul 13, 2015

[FIX] fixed a problem that is caused by a bug in openERP's multiple inheritance. Whenever a there were invoice lines assigned to the user (invoice_ids) they were copied as well
etsinko
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