SAV... not writing over expired files.

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We have a 3581 tape drive.  A typical save does the following:
SAVLIB LIB(QUSRADSM) DEV(TAP04) EXPDATE('01/01/03') ENDOPT(*LEAVE)
OUTPUT(*PRINT)
On Thursday, December 19 we ran this.  And some other saves.  The results
(as displayed via DSPTAP) are:
5722SS1 V5R2M0 020719
Device . . . . . :   TAP04
Owner ID . . . . :   GDI
Type . . . . . . :   *SL
                              Record
                   File       Block
Data File Label    Sequence   Format
QUSRADSM           0000000001 *U
PCBACKUP           0000000002 *U

 TAPE VOLUME INFORMATION         4THU1
     Volume . . . . . :   4THU1
     Density  . . . . :   *ULTRIUM1
     Code . . . . . . :   *EBCDIC

Recg  Record  Block   File        Mvol
Tech  Length  Length  Length      Ind
P     00000   262144  0000001442
P     00000   262144  0000417780  CONT

     GDIHQ       12/27/02 10:53:31




Mvol        Date      Expiration
Sequence    Created   Date
0000000001  12/19/02  12/25/02
0000000001  12/19/02  12/25/02

However, when we went to save on it on the night of Thursday December 26,
we received the following errors:
CPF4284-Cannot add file sequence number *END to full volume 4THU1.

Shouldn't this just get written over?

Rob Berendt
--
"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety."
Benjamin Franklin