Message SAP /IBS/RB343 - Posting record no. &1 is a reclassfication record - reversal not possible

Diagnosis
The selected record was created by a currency exhange, an accountassignment reference change, or by a balance transfer.
For technical reasons, it is not possible to reverse this document.

Procedure
For reversal, start the report /IBS/MRB_RECLASSIFICATION or
the transaction /IBS/RB_RECLAS.