DocuWare doesnt have the same abilities as SoapUI to process data from web services. See below

Docuware can’t process sub child XML elements and self-closing tag as a parameter.

SoupUI can process all standard data types while Docuware can accept Integer and Decimal but seems to inconsistently be able to access some string parameters

Some context objects in SoapUI aren't able to be interacted with in DocuWare because the data types aren't standard (string, decimal etc).