Remove One2many to document
We see similar as described in #7823 (closed) whereas any changes made in the invoice form invoked from the purchases/invoice form is simply discarded. After trying the patch (grafting onto 5.0 from default), the situation is now much worse. The invoice is seen, but there seems to be no way to open the invoice via any relate or action. Funny though, there is still an action to credit the invoice even though it is in draft mode and a report to print the invoice in the current state.
There needs to be a relate mechanism to enter directly into the invoice from this form.