SAP Message AA573 - Caution: FI document can only be reversed completely

Diagnosis
You tried to reverse just the retirement of an asset in an FI document.This is not possible, since other assets or group assets were posted inthe background. These other assets can no longer be clearly assigned tothe current asset.

System Response
The system takes you to the FI reversal transaction.

Procedure
Reverse the FI document completely. Then re-post the part of the FIdocument that you did not actually wish to reverse.