Whenever you experience such a problem, execute Payroll Calculation (or Simulation) again for that employee, but with the "Display log" box checked.
Once you have the log on-screen, you can double clic on the Function or on the pcr in order to see what were the Input values, and what happened in the processing.
When I look at your screen capture, I can see that pcr IN72 will be processing WTs based on Processing Class 72, and the key IN722***** can be translated into pcr IN72, ESG 2, WT **** and return value *
Now, through pe02, look at pcr IN72 for ESG 2 and WT **** and you should be able to see the Query on Pr.Cl. 72 and a list of possible return values, but the return value * is not there, and the WT being processed has a value for Pr.Cl. 72 that is not listed in the pcr.
Solution: Either modify the value of Pr,.Cl, 72 for the WT that generated the error to one of the values considered in the pcr, or add return value * to the pcr with the appropriate Operations (sometimes just ADDWT * ).