Calling a workflow from a program

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Hello All,

I am calling a workflow using FM 'SAP_WAPI_START_WORKFLOW' from se38 abap program.

My workflow consists of simple user decision to approve and reject.

From my t.code SWDD if I execute the workflow, it will take me to test workflow screen and there again I have to execute once more to see the mail with approve and reject button in my inbox of bussiness workplace.

But when I call the worflow using the above FM it does not work.

CALL FUNCTION 'SAP_WAPI_START_WORKFLOW'

EXPORTING

task = 'WS99000093'

language = sy-langu

IMPORTING

return_code = p_subrc

workitem_id = p_workitem.

It doesn't get triggerred I guess. Is there something to do with the double execution as above which takes place when we do it manually ( one normal execution of workflow and another test workflow).

Help Appreciated.

Regards,

Mac