Diagnosis
In infotype P1013 the person group and the person subgroup areallocated to the position. Table T503 contains the valid period('payroll type') for every combination of person group and personsubgroup.

If the person group and person subgroup are allocated to the positionand the planned payment was taken from table T510, the period (payrolltype in T503) is read.
In each case, the entered value is always checked against table T546T.