thanks for the reply.
i'm having tape library unit with a bar-code reader. all this while, everything work fine. that's why i don't u/stand, why the system always generate A0000x+1 for the slot which is no physical tape inside that slot.
Eg. Slot1 to 6 - there is a tapes.
Slot 7 - no physical tape.
when I update the inv. robot, then A0000x+1 will logically assigned to Slot7.
and one more thing, it only happen on Netbackup pool.