I think you posted this to the wrong place. It is not even clear that your question is related to Perl at all.
If you have a problem related to RPC-XML, then you can post it to the appropriate section. You could also try posting on perlmonks. If your problem is unrelated to Perl, then you will have better luck with some other place, a usent group, forum or mailing list about HPUX seems like your best bet.
In any case I don't see how your question relates to XML::Twig, but feel free to correct me.