Code review comment for lp:~akretion-team/account-invoicing/70-add-invoice_fiscal_position_update

@Graeme

Thanks for pointing me to resolve_2many_commands. I managed to make the on_change work in the interface (the tax and account fields are properly updated), but I get a crash when I save... so it's not usable for the moment.

The current code is here : https://code.launchpad.net/~akretion-team/account-invoicing/70-invoice_fiscal_position_update-onchange