SAP Message WLC_PARALLEL043 - The FM &1 for the data preselection ended with undefined error

Diagnosis
The function module &V1& has finished with errors. Unfortunately, thefunction module itself has not given any error messages to describe theerror in detail.
The function module was entered in Customizing forparallel processing the report &V2& externally to select the worklistin advance. This is always the case, if the worklist cannot be selectedgenerically.

Procedure
The function module &V1& was not created by SAP and you must contactthe author. The function module may have to be corrected or, at least,enhanced to include a clearer error message.