Call SOAP method after choosing: SOAP Pass-through

[#1]

Hi community

I have a SOAP method which is now in APIGEE using option: SOAP Pass-through

I'm trying to call one of many soap methods but it is not working, as a URL using the one provided by apigee, the input passed as POST, issue or doubt is about soap action, I used to call the one provided by SOAP UI for example, which is the URL + the method name, in the case of Apigee I just can see a name like a REST name, even after using that single like REST name is not working, I got an: java.io.IOException

Any clue about that?

thanks in advance for your support.