If you get the message that the municipality of taxes at source is not filled in: :

First of all, it is necessary to verify that it is correctly entered in the employee's parameters: :

If it is there, then it may have been put in after the closing. As a reminder: the tax municipalities are stored month by month, person by person, at the time of the closing (just like the various occupancy rates).

It is therefore necessary to fill it in by hand directly in the table. Go to :

There should be no gaps in the list. Enter the code of the tax commune by hand where it is missing.

Rerun the transmission.

In most other error messages, simply read the message and correct the data for the person concerned: