reactivate payment wizard on invoice when account_statement is installed
discussed here in french:
http://www.tryton.org/~irclog/fr/2012-01-03.log.html
In short: activating the statement module should not completely deactivate the
payment wizard on invoices.
Of course, mixing statement based and normal entry on an accounting journal is
indeed a bad idea, so the wizard can not be left active as is. But enforcing
full statement entry on all journals is also not such a good idea. The
accounting result is the same in both cases, but the method of entry should be
adapted to each case.
A better way would be to let the wizard active, but somehow only show accounting
cash journals which are not statement treated. The selection could be by
configuration, or by detecting which cash journals have no associed statement
journal.