move data problem

I tried to move data from one tape to another. and it is failed becouse
of no enough mount point.

My question is:
  I specified to move data from tape B001 to same storage pool only.
Why B002 required move data also?
  How can I achive the moving data from B001 to the same storage pool?
what is the procedure I have to do?
  Before I move data, I set tape B001 to read-only.  did it cause the
no enogh mount point or not?

The message after run move data is:
ANR1157I Removable volume B001 is required for Move Data process.
ANR1157I Removable volume B002 is required for Move Data process.
ANR8324I 3590 volume B001 is expected to be mounted (R/O).
ANR8324I 3590 volume B002 is expected to be mounted (R/O).
ANR1145W Move data process terminated for volume B001 -
    insufficient number of mount points available for removable media.

The information of our setting is:
Volume Name Storage      Device      Estimated  %Util   Volume
            Pool Name    Class Name  Capacity           Status
----------  ---------    ----------  ----------  ----   ------
B001        BACKUPTAPE    3590TAPE    9,084.3    49.9    Full
B001        BACKUPTAPE    3590TAPE    9,084.3    49.9    Full
B002        BACKUPTAPE    3590TAPE    9,101.9    50.3    Full
B003        BACKUPTAPE    3590TAPE    9,252.0    86.1    Full
B004        BACKUPTAPE    3590TAPE    9,136.5    37.8    Full
B005        BACKUPTAPE    3590TAPE    9,107.2    31.5    Full
B006        BACKUPTAPE    3590TAPE    9,128.5    43.1    Full
B007        BACKUPTAPE    3590TAPE    9,137.4    40.9    Full
B008        BACKUPTAPE    3590TAPE    9,144.1    53.7    Full
B009        BACKUPTAPE    3590TAPE   10,000.0    17.6    Filling
B010        BACKUPTAPE    3590TAPE        0.0     0.0    Empty

Our tapy volume(B001-B010) setting is:
              Volume Name: B001
        Storage Pool Name: BACKUPTAPE
        Device Class Name: 3590TAPE
  Estimated Capacity (MB): 9,084.3
                    %Util: 49.9
            Volume Status: Full
                   Access: Read/Write
   Pct. Reclaimable Space: 50.1
          Scratch Volume?: No

Any comments will be appreciated

Thanks in advance

Julie Xu

J.Xu AT uws.edu DOT au
          In Error State?: No
 Number of Writable Sides: 1
  Number of Times Mounted: 25
        Write Pass Number: 1
Approx. Date Last Written: 10/19/96 01:19:19
   Approx. Date Last Read: 11/12/96 08:46:55
      Date Became Pending:
   Number of Write Errors: 0