Similar to your previous node, try passing a reference to the @pkg array:
XRC::changePkg( $username, \@pkg );
I still don't have access to the required wsdl file, so it's a bit of a guess, but here's what SOAP::Lite generates for the array without the wsdl:
<soapenc:Array soapenc:arrayType="xsd:int" xsi:type="soapenc:Array"
I think you'll find it'll turn out alright when the wsdl is in place.
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