Trouble with adding commission to new employee

A few of our employees receive a fixed $ commission per unit sold. I am having a very hard time getting this commission to show up for a new employee. The commission line shows up in the paycheque window for the existing employees, but it does not show up for the new employee. Any tips are very welcome. Must be a widget or switch that needs to be flipped, but I can't find it. Thanks for the help.

Kind regards, Rolf