Diagnosis
The physical source object belonging to the current version of thetarget object was lost.
There could be a difference between the version displayed in the WebBrowser and the version of the source object.

Procedure
Compare the content object displayed in the Web Browser with thecorresponding content object in your Info Object List.
If the content object displayed in the Web Browser contains more recentinformation than the source object in the Info Object List, copy thecontents of the content object displayed in the Web Browser to thecontent object of the Info Object List.
Then save the content object.
The target object is created again and the relationship to the targetobject is restored.