Can't get BAPI return node in web dynpro!!

I'm calling BAPI in web dynpro, I already map the <BAPIName>_Input->Output->Return to our custom controller context. I can get the value of some other output parameters in Output node, but can't get the return node.
wdContext->currentOutputElement is Ok, but wdContext->currentBapiReturnElement is null, what is the problem??!!!
Can anybody give me an hint, or give me a example to access the return value of Bapi??
Thank you very much!
Regards,
Xiaoming Yang

Hi Vitaliano,
Thanks for your reply.
yes, I've call the invalidate method, like this:
wdContext.currentBapi_Trip_Create_From_Data_InputElement().modelObject().execute();
//wdContext.nodeBapireturn().invalidate();//do I need this?
wdContext.nodeOutput().invalidate();
But it still can't work!
The return node is a child note of Output, does it ok?
Thank you!

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Message was edited by: Anilkumar Vippagunta

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Can't get BAPI return node in web dynpro!!

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