My issue sounds similar to #39 but is about the xsys.003.001.01 message type.
The ThirdPartyRefusalReason element is of type SwAny but when I try to parse a message with a 4 character string in that element, for example:
<Sw:ThirdPartyRefusalReason>ABCD</Sw:ThirdPartyRefusalReason>
then SwAny.any is null.