Error deleting data area...

For the second time in a few days, we have received this error when trying
to delete a data area within a batch job.

The data area is created in the submitting program.  Then a new program is
submitted.  The submitted program checks for the data area, retrieves its
value, and is supposed to delete the data area.  It has worked fine for a
number of years.

If the object was locked by something else, I would have expected to see
CPF2114 (Cannot allocate object WHICH01 in RTAM type DTAARA. ). But instead
we're getting CPFA030 (Object already in use) which mentions threads.

Along with a program dump, the system printed the job information.  There
was only one thread for the job...

 5722SS1 V5R2M0 020719                      Work with Job
                                               Threads
                           Total        Aux         Run
 Thread   Status      CPU         I/O       Priority
00000004  RUN            .066         57       50


Anyone have any ideas ??

Thanks,
Todd

A snippet of the job log....

 Message . . . . :    12800 - CHKOBJ OBJ(RTAM/WHICH01) OBJTYPE(*DTAARA)
    05/11/09  00:40:55.174600  QCADRV       QSYS        0391     CIRT0200
R
 Message . . . . :    13300 - RTVDTAARA DTAARA(RTAM/WHICH01) RTNVAR(&WHICH)
    05/11/09  00:40:55.183232  QCADRV       QSYS        0391     CIRT0200
R
 Message . . . . :    13400 - DLTDTAARA DTAARA(RTAM/WHICH01)
   05/11/09  00:40:55.206864  QP0QCHK      QSYS        *STMT    CIRT0200
R
 From module . . . . . . . . :   QP0QCHK
 From procedure  . . . . . . :   qp0qchk__FP15chk_parms_block
 Statement . . . . . . . . . :   642
 Message . . . . :   Object already in use.
 Cause . . . . . :   Cannot allocate object for reason code 1. 1 -- Object
   WHICH01 of type *DTAARA in library RTAM is in use by another thread. 2
--
   Member WHICH01 in file , library RTAM is in use by another thread.
Recovery
   . . . :   Wait until the object is no longer in use and try the request
again.
   05/11/09  00:40:55.252880  QCLXERR      QSYS        00DA     QCLXERR
Q
 Message . . . . :   CPFA030 received by CIRT0200 at 13400. (C D I R)
 Cause . . . . . :   Control language (CL) program CIRT0200 in library RTAM
   detected an error at statement number 13400. Message text for CPFA030
is:
   Object already in use. Recovery  . . . :   This inquiry message can be
   avoided by changing the program. Monitor for the error (MONMSG command)
and
   perform error recovery within the program. To continue, choose a reply
   value. Possible choices for replying to message . . . . . . . . . . . .
. .
   . :   C -- Cancel the CL program. D -- Dump the CL program variables and
   cancel the CL program. I -- Ignore the failing command. R -- Try the
failin
   command again.
    05/11/09  00:40:55.268208  QMHSNINQ     QSYS        0CDD     QCLXERR
Q
 Message . . . . :   D
0   05/11/09  00:40:55.233824  QMHUNMSG                 *N       QCMD
Q
 Message . . . . :   Function check. CPFA030 unmonitored by CIRT0200 at
   statement 13400, instruction X'006F'.