SAP Message WL864 - Work item &: Background job & cannot be scheduled (error &)

Diagnosis
An error occurred when scheduling the specified background job, whichis used for the deadline monitoring of the specified work item.

System Response
The action was terminated. It may not be possible to reverse allchanges made to the specified work item.
INCLUDE NA_WF-ADMINISTRATOR OBJECT DOKU ID TX
The specified error number should indicate possible reasons for theerror. It is possible that the system is in an inconsistent state. Thescheduled start of the specified background job must be compared withthe minimum date/time of all work items in table SWWDHMIN. It may benecessary to delete the scheduled background job by hand and rescheduleit by calling report RSWWDHEX.