How to send data from a web dypro application using workflow

Hi All,
I am working on a web dynpro application where the user will enter the header and item details for a FI document to be posted. Once the user enters the data the workflow should initiate and should also send the data across to the approver to approve. To initiate the workflow I am using the function module 'SAP_WAPI_START_WORKFLOW' and it's working fine and generating a uniquw workflow item id. Now my main concern is how to send the data across from web dynpro application through the workflow. I have my data in three internal tables: 1. header table. 2. G/L table and 3. Currency table, I am capturing all this data from the web dypro screen entered by the user. Right now I have the following code in my web dypro application.
METHOD execute_bapi_acc_document_post .
  DATA: return TYPE TABLE OF bapiret2.
  DATA: wa_return LIKE LINE OF return.
  DATA lo_bapi_acc_document_po TYPE REF TO if_wd_context_node.
  DATA lo_changing TYPE REF TO if_wd_context_node.
  DATA lo_accountgl TYPE REF TO if_wd_context_node.
  DATA lo_currencyamount TYPE REF TO if_wd_context_node.
  DATA lo_importing TYPE REF TO if_wd_context_node.
  DATA lo_documentheader TYPE REF TO if_wd_context_node.
  DATA lo_element TYPE REF TO if_wd_context_element.
  DATA lt_elements TYPE wdr_context_element_set.
  DATA ls_c_documentheader TYPE if_componentcontroller=>element_documentheader.
  DATA lt_c_accountgl TYPE if_componentcontroller=>elements_accountgl.
  DATA ls_c_accountgl LIKE LINE OF lt_c_accountgl.
  DATA lt_c_accountgl_cp TYPE if_componentcontroller=>elements_accountgl.
  DATA lt_c_currencyamount TYPE if_componentcontroller=>elements_currencyamount.
  DATA ls_c_currencyamount LIKE LINE OF lt_c_currencyamount.
  DATA lt_c_currencyamount_cp TYPE if_componentcontroller=>elements_currencyamount.
  DATA wa_c_currencyamount type bapiaccr09.
CALL FUNCTION 'SAP_WAPI_START_WORKFLOW'
  EXPORTING
    TASK                      = 'TSXXXXXXXXXX'            
   USER                      = sy-uname
IMPORTING
   RETURN_CODE               = L_RETURN_CODE
   WORKITEM_ID               = LV_WIID
TABLES
*   INPUT_CONTAINER           = lt_input_container
   MESSAGE_LINES             = lt_message_lines
   AGENTS                    = ls_agents
  lo_bapi_acc_document_po = wd_context->get_child_node( wd_this->wdctx_bapi_acc_document_po ).
  lo_changing = lo_bapi_acc_document_po->get_child_node( wd_this->wdctx_changing ).
  lo_accountgl = lo_changing->get_child_node( wd_this->wdctx_accountgl ).
  lo_currencyamount = lo_changing->get_child_node( wd_this->wdctx_currencyamount ).
  lo_importing = lo_bapi_acc_document_po->get_child_node( wd_this->wdctx_importing ).
  lo_documentheader = lo_importing->get_child_node( wd_this->wdctx_documentheader ).
  lo_element = lo_documentheader->get_element( ).
  lo_element->get_static_attributes(
    IMPORTING static_attributes = ls_c_documentheader ).
  lt_elements = lo_accountgl->get_elements( ).
  LOOP AT lt_elements[] INTO lo_element.
    lo_element->get_static_attributes( IMPORTING static_attributes = ls_c_accountgl ).
    INSERT ls_c_accountgl INTO TABLE lt_c_accountgl[].
  ENDLOOP.
  lt_c_accountgl_cp = lt_c_accountgl[].
  lt_elements = lo_currencyamount->get_elements( ).
  LOOP AT lt_elements[] INTO lo_element.
    lo_element->get_static_attributes( IMPORTING static_attributes = ls_c_currencyamount ).
    INSERT ls_c_currencyamount INTO TABLE lt_c_currencyamount[].
  ENDLOOP.
  lt_c_currencyamount_cp = lt_c_currencyamount[].
  READ TABLE lt_c_currencyamount INTO ls_c_currencyamount INDEX 2.
  ls_c_currencyamount-amt_doccur = ls_c_currencyamount-amt_doccur * '-1.0000'.
  MODIFY lt_c_currencyamount FROM ls_c_currencyamount INDEX 2.
  CALL FUNCTION 'BAPI_ACC_DOCUMENT_POST'
    EXPORTING
      documentheader = ls_c_documentheader
    TABLES
      accountgl      = lt_c_accountgl
      currencyamount = lt_c_currencyamount
      return         = return.
ENDMETHOD.
Please suggest.
Thanks,
Rajat
I am not sure if this falls in webdynpro or workflow threads.. so I am posting it here also
Edited by: rajatg on Jun 23, 2010 9:28 PM

Dear Colleague,
You have different method to send parameters to Workflow.
1. Method
Container Set Element
DEFINE SWC_SET_ELEMENT.
  CALL FUNCTION 'SWC_ELEMENT_SET'
    EXPORTING
      ELEMENT   = &2
      FIELD     = &3
    TABLES
      CONTAINER = &1
    EXCEPTIONS
      OTHERS    = 1.
END-OF-DEFINITION.
Set the data into Workflow container
    SWC_SET_ELEMENT IT_CONTAINER 'parameter1' lv_parameter1.
Start the Workflow
    CALL FUNCTION 'EWW_WORKFLOW_START'
      EXPORTING
        X_TASK          = 'WS90000001'   " your wf
      IMPORTING
        Y_WORKFLOW_ID   = WF_ID " your workitem id
      TABLES
        X_CONTAINER     = IT_CONTAINER
      EXCEPTIONS
        INVALID_TASK    = 1
        NO_ACTIVE_PLVAR = 2
        START_FAILED    = 3
        GENERAL_ERROR   = 4
        OTHERS          = 5.
2. Method,
You can also add your parameters direly to a container,
  DATA: lt_simple_container TYPE TABLE OF swr_cont,
        ls_simple_container TYPE swr_cont.
  ls_simple_container-element = 'parameter1'.
  ls_simple_container-value = lv_parameter1.
  APPEND ls_simple_container TO lt_simple_container.
  CALL FUNCTION 'SAP_WAPI_WRITE_CONTAINER'
    EXPORTING
      workitem_id      = WF_ID " your workitem id
      do_commit        = 'X'
    TABLES
      simple_container = lt_simple_container.
Bulent.

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