Web service error in response "Element '{}return' missing"

Hi all,

I'm quite new to ABAP development on Web services, and I encountered a problem after calling a web service method.

I created a Service Consumer proxy from an external WSDL, then created its port in SOAMANAGER.

Now, when I call one of its methods, an exception occurs. But I was able to debug that there is a response being sent by the web service. However, during the CALL TRANSFORMATION (found in class CL_SXMLP_DATA_ST method IF_SXML_SERIALIZABLE~DESERIALIZE) it raises the error:

Element '{<namespace>}return' missing

(I can't show the namespace but it's like "https://xxx.xxxxxxxxxxxxx.com/xxxxxxxx")

I tried to search the forums about this, but haven't found any yet that could help me. I can't also modify the code since this is already SAP standard.

Thanks in advance!