Diagnosis
You have chosen the selection button in front of the entry field in thegroup Parallel processing using selection options, but the tablefield which should contain the values to distribute the worklist amongthe parallel jobs has not been entered in the TABLE-FIELDformat.
The system tests whether the character string contains an '-' tointerprate the first part as the table name and the last part as thefield name.

Procedure
Change your entries as detailed.