加锁时，有时候需要判断谁占用了该表
call function 'ENQUEUE_READ'
exporting
gclient = gclient
gname = 'EWUARCHIV'
garg = garg
guname = space
importing
number = number
subrc = subrc
tables
enq = enq
exceptions
communication_failure = 1
system_failure = 2
others = 3.
if subrc = 0 and number ne 0.
read table enq index 1.
if sy-subrc = 0.
message i510(eu) with enq-guname 'EWUARCHIV'.
else.
message i521(eu) with 'EWUARCHIV'.
endif.
else.
message i521(eu) with 'EWUARCHIV'.
endif.
aendern = space.
when others.
message s010(ad) with 'Nur Anzeige m?glich.'(011).
aendern = space.
例：
FORM zform_lock_data USING u_matnr TYPE matnr
u_lgpla TYPE lgpla
CHANGING lock_name TYPE string.
CLEAR g_it_lock_name.
CLEAR g_wa_lock_name.
CLEAR lock_name.
CALL FUNCTION 'ENQUEUE_EZ_STOCK_MOVE'
EXPORTING
mode_zstock_view = 'X'
matnr = u_matnr
lgpla = u_lgpla
* X_MATNR = ' '
* X_LGPLA = ' '
* _SCOPE = '2'
* _WAIT = ' '
* _COLLECT = ' '
EXCEPTIONS
foreign_lock = 1
system_failure = 2
OTHERS = 3
.
IF sy-subrc <> 0.
CALL FUNCTION 'ENQUEUE_READ'
EXPORTING
gclient = sy-mandt
gname = 'ZSTOCK_VIEW'
garg = ' '
guname = ''
TABLES
enq = g_it_lock_name.
LOOP AT g_it_lock_name INTO g_wa_lock_name.
IF g_wa_lock_name-garg(18) = u_matnr AND g_wa_lock_name-garg+18 = u_lgpla.
CONCATENATE lock_name
g_wa_lock_name-guname ':' INTO lock_name.
ENDIF.
ENDLOOP.
ENDIF.
ENDFORM.