how to extract the integration result response

Hi there, I have an integration, the returned result is as above.

How do I extract the information for "MATERIALDOCUMENT"? in the "data" tag of integration in my process model, I add a custom output  as "AC!Result.body.BAPI_GOODSMVT_CREATE.Response.MATERIALDOCUMENT", save to a process variable. but nothing is saved in this process variable. anyone can help on this?

Thanks.

 

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