Button with Eval('one2many_field') does not work
A button with an invisible attribute where it checks the value of a o2m fields fails to properly update the state of the button.
The problem was found with the account_bank_statement_es_csb43, the field definition can be found [1]. The button is never shown in sao, but it does on the GTK client.
[1] https://bitbucket.org/trytonspain/trytond-account_bank_statement_es_csb43/src/14fb71b5493719f08d6d7c98c14d4bebe3926545/statement.py?at=default&fileviewer=file-view-default#statement.py-26