Diagnosis
The reversal document contains a reference to an original document thatdoes not exist or is in another period.

Procedure
If the original document is posted in another period, you can find it byrunning a check over the span of periods (+/-1 month or more) thatcontain the reversal month. An error message should appear that refersto a missing line item in the reversal document mentioned above. Thedocument that the error message refers to should be the originaldocument for this reversal document.