Hi Katarzyna,
Are there multiple elements of SaveCreditCardResponse, or is there (always) just the one? If so, why not use just "//id" as the XPath expression for the source?
I've run into problems before using namespace declarations. It's hard to know exactly what's going wrong for you without seeing the full request & response messages, but I suspect it has something to do with the XPath expression not being deemed valid by SoapUI (because of the namespace prefix) - even if it appears to be valid, and is accepted by external tools (e.g. XMLSpy).
Kind regards,
Tim
