SYMPTOM:
In Strategy Developer and Object Manager 9.3.x, the following error message shows up when copying a report:

The source manipulator found a missing dependency. Object: <Drill Map id=xxxxx> is not found. A total of 1 object(s) need it, one of which is “Report name” <Report Definition id=xxxxx>

The requested object with id xxxxx and type 56 (Drill Map) does not exist in the object context.