Forwarded successfully the workitem for BO-BUS2000220(complaint) in the worklist of other user: Problem in "Sent date" not reflecting correctly in SAP CRM 7.0 Web UI

I am working with SAP CRM 7.0. We have a workflow in the system which is triggered at the creation of complaint(BO:BUS2000220) and then assign the complaint workitem

in the woklist of specified agent. I have created a report and scheduled it daily to forward the complaint into the worklist of user B from worklist of user A after 7 days

from creation date of complaint. But the problem is that the forwarded complaint is showing in the worklist of user B with sent date(the creation date of complaint, not the

forwarded date).

Relevant code:

IF gw_complain-PROCESS_TYPE = 'ZCMS' AND age_complaint = 8.

          CALL FUNCTION 'SAP_WAPI_WORKITEMS_TO_OBJECT'

           EXPORTING

objtype         = 'BUS2000120'

objkey          = obj_guid_key

top_level_items = ' '

SELECTION_STATUS_VARIANT       = 0001

           IMPORTING

return_code     = return_code

           TABLES

worklist        = it_worklist[].

READ TABLE it_worklist INTO wa_worklist WITH KEY wi_type = 'W'.

CALL FUNCTION 'SAP_WAPI_FORWARD_WORKITEM'

            EXPORTING

workitem_id    = wa_worklist-wi_id

              USER_ID        = wa_worklist_esc-ESC_USER

LANGUAGE       = SY-LANGU

DO_COMMIT      = 'X'

CURRENT_USER   = wa_worklist_esc-CURRENT_USER

            IMPORTING

RETURN_CODE    = lv_return_code

            TABLES

MESSAGE_LINES  = lv_mesg

* MESSAGE_STRUCT =

* USER_IDS       =

            .

1. ENDIF.

Can someone help me how to change the sent date to actual forwarded date of complaint.