Hello
Check enhancement XMRM0001 on transaction SMOD.
The following exits are available here:
EXIT_SAPLBARM_001 Customer Exit: RM_BACKFLUSH_CHECK
EXIT_SAPLBARM_002 Customer Exit: RM_BACKFLUSH_GO
EXIT_SAPLBARM_003 Customer Exit: RM_CANCEL_BACKFLUSH_CHECK
BR
Caetano