See this program, its an example of how to work with SOAP::Lite, how to test, and debug.

Then switch to SOAP::Simple

For an older example, see Re: Confusing results from Soap Lite, Re^5: SOAP call tweaks required, and search with ?node_id=3989;BIT=serializ;HIT=re%20soap;a=%5BAnonymous%20Monk%5D for more