new employee grouping

hi everybody
I have created a new employee grouping in order to map a wage type to two different gl accounts. But the problem is that when I run payroll for that employee the wage types included in infotype 8 are not shown  so the result of the payroll is wrong there is no wage types in the payslip.
What I did was this:
1)     Create a new employee grouping in table V_T52EM
2)     Assign it to the grouping in feature PPMOD
3)     Check the checkbox for MOMAG in table V_T52EK

thanks in advance for your help!

Kind regards

Rosina