SAP Message WL816 - Work item &: Deadline data cannot be set (table &)

Diagnosis
The deadline monitoring data for the work item cannot be changed.Either the relevant work item data (table SWWWIDEADL) or thecontrol table of all deadlines for monitoring the background jobSWWDHEX (table SWWWIDH) could not be updated.

System Response
The action was aborted and the work item remains unchanged.
INCLUDE NA_WF-ADMINISTRATOR OBJECT DOKU ID TX

Procedure for System Administration
Check the scheduling of the background job SWWDHEX.