Prior to Release 4.0, users authorized to delete reservations (transaction MB22) could carry out mass deletions (transaction MBVR) as well as individual deletions.
As of Release 4.0A, you need a special authorization for mass deletions.
In the system administration, you determine for the authorization objects reservations: plant (M_MRES_WWA) and reservations: movement type (M_MRES_BWA) who is authorized to delete and manage reservations using transaction MBVR.
If you have assigned the authorization '*', you do not need to change anything. If you have maintained activities 02 (change) und 06 (delete), you also have to maintain activities 65 (reorganize) und 70 (manage).
For further information, refer to the documentation for the authorization objects M_MRES_WWA and M_MRES_BWA.