How To Fix WLC_PARALLEL043 - The FM &1 for the data preselection ended with undefined error

SAP Error Message - Details

• Message type: E = Error

• Message class: WLC_PARALLEL - Load Distribution and External Parallel Processing

• Message number: 043

• Message text: The FM &1 for the data preselection ended with undefined error

What causes this issue?

The function module &V1& has finished with errors. Unfortunately, the
function module itself has not given any error messages to describe the
error in detail.
The function module was entered in <DS:TRAN.WLCPARC>Customizing</> for
parallel processing the report &V2& externally to select the worklist
in advance. This is always the case, if the worklist cannot be selected
generically.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

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

Error message extract from SAP system. Copyright SAP SE.