Field help (EMPOBJRUB) 

Net to gross payroll calculation.
Performing this payroll calculation will generate a payslip having an 'objective' heading set to a given value, by varying the value of a secondary variable. For instance, the aim can be to vary payslips with a net salary set according to the employee, by modifying their basic salary. In this case:

SEEINFO By default, the 'objective heading', 'objective variable' and 'secondary variable' elements are submitted based on the parameters entered in the payroll plan.