Diagnosis
In view Benefit plan (V_5UBA_WT) you have defined the wage type to beused in the calculation of the benefit salary.
The system could not find this entry in view Wage type characteristics(V_T511).

Procedure
Go to the view Benefit plan (V_5UBA_WT), and select the plan for whichthe Benefit Salary is to be calculated.
Check that the field "Calculation base" contains the correct wage type.This entry defines which payment(s) to the employee should be used inthe calculation of the benefit salary.
Go to view Wage type characteristics (V_T511) and check that there isthe corresponding entry.