Adding attachments to workflow from Web Dynpro ABAP Application program.

Hi,
workflow is supposed to start by a Web Dynpro ABAP Application.
The user can attach files to it.
A superior is supposed to review the files and either approve or reject the request.
I tried the following in Web Ddynpro ABAP:
CALL FUNCTION 'EWW_WORKFLOW_START'
EXPORTING
X_TASK = 'WS90000074'
IMPORTING
Y_WORKFLOW_ID = lv_WF_ID
TABLES
X_CONTAINER = lv_IT_CONTAINER
EXCEPTIONS
then followed by:
CALL FUNCTION 'SAP_WAPI_ATTACHMENT_ADD'
EXPORTING
WORKITEM_ID = lv_wf_id
ATT_HEADER = lv_swr_att_header
ATT_BIN = Item_FILENAMEATTACHED
DOCUMENT_OWNER = SY-UNAME
LANGUAGE = SY-LANGU
IMPORTING
ATT_ID = lv_swr_att_id
The Workflow has only one user decision step and one notification Step.
In the user decision step, there is a binding from ATTACHOBJECTS to the task.
But, in the log, you can see the attachment in the Workflow Container of the workflow instance, but you don't see it in the task (neither Inbox nor UWL)
I have checked the binding it is correct. I am getting the attachment in workflow container in '_attach_objects' element. but this attachment has to go to the user decision step, so I am binding the '_attach_objects' of workflow container to '_attach_objects' of user decision step. But the attachment was not going to user decision step.
Could you please let me know where am i doing wrong?
Thanks,
V.Nagaraju

@Ruslim Chang
Sorry to point out but the FM will return the Workitem ID only so there is no problem with the LV_WF_ID variable.
@vundralla nagaraju
Instead of making binding between attachobjects make binding between
WiGroup_ID <---- attachobjects
and then on the next step you try to make biniding in the user decision step by using WiGroup_ID.I think it should work.

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