Field help (EMPDED) 

When the employee has been granted a specific fixed deduction due to professional expenses, specify: the rate of the deduction and the option that is linked to it (either 'fixed' or 'actual'). 
In the payroll plan, if a specific fixed deduction for professional expenses is entered, a capped deduction of contribution bases is applied.
If the employee's option is 'fixed', the FRAIS_PROF heading is activated. This heading is added to the gross amount and loads French Dads-u total US41010044 "Amount of professional expenses". The amount of the uncapped deduction is subtracted from the gross tax amount (BRUT_FISC heading) and the new amount loads Dads-u total US41010035 "Gross tax basis".