SAP Message WA638 - Type linkage & & for &: Indicator for type linkage not deleted

Diagnosis
The indicator denoting that the specified linkage from object type andevent to receiver type is atype linkage cannot bedeleted.

System Response
The action was aborted and the indicator remains unchanged. Only if theindiator is NOT set, is the linkage interpreted as aninstance linkage.
INCLUDE NA_WF-ADMINISTRATOR OBJECT DOKU ID TX

Procedure for System Administration
Check whether the specified linkage exists.
INCLUDE WF_NA_EVENT_GLOBAL_FLAG OBJECT DOKU ID TX