Diagnosis
You want to reverse a document. Several Controlling documents werefound for the key.

System Response
If you want to post despite this message, all documents found by thesystem will be reversed.

Procedure
If this message is not an error message, check whether you really wantto reverse all documents.
If this message is an error message, you should execute a reversal byspecifying the CO document number and the controlling area.
In Customizing you can either disable this message or change it from anerror message to a warning or a note. To do this, see theImplementation Guide (IMG) "Controlling General" workstep"Change message control" (Work area"BK", Message number "191").