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
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I could easily be wrong about that, though.