Prevent Posting of an Inbound SHIPPL IDOC using EXIT_SAPLV56I_011?

Question

Under certain circumstances (current shipment status), I need to prevent the update of a Shipment from an Inbound SHIPPL IDOC.  The documentation for function module EXIT_SAPLV56I_011 states:
If a check determines that the shipment is not to be updated, the
return code should be set to value zero and the cause should be noted
in an entry in table IDOC_STATUS.
I have programmed according to the documentation (see below). The IDOC
status reflects my status correctly (63) however the Shipment is still
updated even though the return code is set to zero.
IF lv_sttrg = '5'.
ls_bdidocstat-docnum = idoc_contrl-docnum.
ls_bdidocstat-status = '63'.
ls_bdidocstat-msgty = 'E'.
ls_bdidocstat-msgid = 'VW'.
ls_bdidocstat-msgno = '238'.
ls_bdidocstat-msgv1 = gs_e1tpshh-shpid.
ls_bdidocstat-msgv2 = lv_sttrg.
APPEND ls_bdidocstat TO idoc_status.
subrc = 0.
EXIT.
ENDIF.
Looking for any ideas as to why this logic is not working.
Thanks in advance for any iinput.

Answer 1

Hi,
I think, you should set the value of SY-SUBRC to non-zero value.   See the Code after the call to the Enhancement component "EXIT_SAPLV56I_011", it proceeds with creation of SHIPMENT if SY-SUBRC is initial.
See the Code in include "LV56IF0T", Line number 111,133.
if call_subrc ne 0.
      subrc = call_subrc.
    endif.
    if subrc is initial.
* Shipment check complete
      perform shipment_event_check_complete
                       changing subrc.
    endif.
endif.
Regards
Vinod