Before this commit (in the case the `custom_mode` is set to `wire_transfer`)
the model tries to find existing bank accounts to compute a pending message
with the necessary information. When bank accounts are not already setup
we end with an incomplete message.
After this commit we can at any point recompute the pending message and it
will be updated with the current bank information.
Task - 2511080
closesodoo/odoo#103903
Signed-off-by: Antoine Vandevenne (anv) <anv@odoo.com>