You seem to be using Java Axis. Are you able to use the WSDL from a Java client to call the server, instead of SOAP::Lite?
I'm not a WSDL expert or anything, but yours doesn't look right to me. I'd think you'd need another <element> definition in there for each thing inside of the <offerIDs> element, like
<xs:complexType name="ArrayOfInt">
<xs:complexContent>
<xs:restriction base="soapenc:Array">
<xs:sequence> <!-- NB: adding 'item' elements here -->
<xs:element name="item" type="xsd:int"/>
</xs:sequence>
<xs:attribute ref="soapenc:arrayType" wsdl:arrayType="xs:int[]"/
+>
</xs:restriction>
</xs:complexContent>
</xs:complexType
I could easily be wrong about that, though.