how to unlock a object

Hi all,

          I add a lock by the function  'ENQUEUE_*', and want to unlock it by the function ' DEQUEUE_*', but it can not be unlocked.

     Only when it leaves the program, it can be unlock.

     And i do not want to use the function 'ENQUE_DELETE'.

     code:

CALL FUNCTION 'ENQUEUE_EZ_FI_HTFK'

     EXPORTING

       mode_zmmt_htfk = 'E'

       htno_d         = zshth-htno_d

*     ITEM           =

     .

CALL FUNCTION 'DEQUEUE_EZ_FI_HTFK'

     EXPORTING

       mode_zmmt_htfk = 'E'

       htno_d         = zshth-htno_d

*     _SCOPE         = '2'

*     ITEM           =

     .