Call WAPI error in web dynpro app

I write a very simple demo workflow, there is a approve step that call a web dynpro app.
I pass workitemid to my web dynpro program, then It call fm SAP_WAPI_RESERVE_WORKITEM and SAP_WAPI_WORKITEM_COMPLETE to comlete workitem programmly.
In SAPGUI workplace ,I receive a message ,then I execute workitem,web dynpro UI page is showed.When I execute approve operation(call two wapi fm above in approve event handler),SAP_WAPI_RESERVE_WORKITEM and SAP_WAPI_WORKITEM_COMPLETE's export parameter "return_code" is 1.
But I test/execute my web dynpro program standalone in workbench,all is ok,demo workflow continue.
I have spent a plenty of time for it,help me!
I'm sorry for my poor english .

Thanks for your advice. I am a new one for SAP development.
According to your advice, I use SAP_WAPI_DECISION_COMPLETE instead of SAP_WAPI_RESERVE_WORKITEM and SAP_WAPI_WORKITEM_COMPLETE, I get the same result.
test web dynpro application standalone, it's ok;in SAP workplace ,SAP_WAPI_DECISION_COMPLETE method's exporting parameter "return_code" is 1.
My code is following :
CALL FUNCTION 'SAP_WAPI_DECISION_COMPLETE'
EXPORTING
    WORKITEM_ID          = l_wi_id
    LANGUAGE             = SY-LANGU
    USER                 = SY-UNAME
    DECISION_KEY         = 0001
    DO_COMMIT            = 'X'
IMPORTING
    RETURN_CODE          = returncode

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