SAP_WAPI_CREATE_EVENT NOT PASSING DATA TO WORKFLOW TEMPLATE CONTAINER

Hi Everyone,

Iam using FM 'SAP_WAPI_CREATE_EVENT' in a BAdi to trigger Workflow for posting the Goods Receipt through MIGO transaction.

BO iam using is : 'MKPF' and event is 'CREATED' and key is the Concatenation of MBLNR and YEAR.

Workflow is getting triggered when iam checking Workflow LOG..But iam passing some VALUES in Table Parameter(INPUT_CONTAINER) to get collected in WORKFLOW CONTAINER which is not happening.

Below is the Code iam using for triggering the workflow:

CONCATENATE 'US' wa_wfgr-approver INTO l_approver.

CLEAR: wa_input_cont.
REFRESH: ist_input_cont.
wa_input_cont-element = 'MAT_DOC'.
wa_input_cont-value = wa_mseg-mblnr.
APPEND wa_input_cont TO ist_input_cont.
CLEAR: wa_input_cont.

wa_input_cont-element = 'MJAHR'.
wa_input_cont-value = wa_mseg-mjahr.
APPEND wa_input_cont TO ist_input_cont.
CLEAR: wa_input_cont.

wa_input_cont-element = 'FIRST_AGENT'.
wa_input_cont-value = l_approver.
APPEND wa_input_cont TO ist_input_cont.
CLEAR: wa_input_cont.

wa_input_cont-element = 'PLANT'.
wa_input_cont-value = wa_mseg-werks.
APPEND wa_input_cont TO ist_input_cont.
CLEAR: wa_input_cont.

wa_input_cont-element = 'BSART'.
wa_input_cont-value = l_bsart .
APPEND wa_input_cont TO ist_input_cont.
CLEAR: wa_input_cont.

CALL FUNCTION 'SAP_WAPI_CREATE_EVENT'

EXPORTING
               object_type   = 'MKPF'
               object_key    = l_display
               event             = 'CREATED'
*             commit_work = 'X'

IMPORTING
               return_code = rc
               event_id      = EVENT_ID

TABLES
               input_container   = ist_input_cont
               message_lines   = mess_lines
               message_struct  = mess_struct.

I Checked the Linkage in SWE2,it is there.

Pls Suggest..