BAPI_USER_GET_DETAIL as SOAP service on PI/PO

Hi Experts,

I have a new scenario, SOAP->PO->RFC to S4/Hana system, using the standard functions BAPI_USER_GET_DETAIL and BAPI_USER_CREATE1. When I try to test this scenario, sending valid data on the payload, the response message shows only the return structure with the fields:

<TYPE>E</TYPE>

<ID>01</ID> <NUMBER>279</NUMBER>

<MESSAGE>Enter a user name</MESSAGE>

<LOG_NO/>

<LOG_MSG_NO>000000</LOG_MSG_NO>

<FIELD>BNAME</FIELD>.

Please keep in mind when testing the function on se37 and it works.

Any advice on what is missing?