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sub changePkg {
        my ($username, $pkg) = @_;
...
                $username,
                $pkg);
}

<wsdl:message name="setUserOffersRequest">
  <wsdl:part name="clientID" type="xs:int"/>
  <wsdl:part name="username" type="xs:string"/>
  <wsdl:part name="offerIDs" type="types:ArrayOfInt"/>
</wsdl:message>

<xs:complexType name="ArrayOfInt">
  <xs:annotation><![CDATA[
...
    </xs:restriction>
  </xs:complexContent>
</xs:complexType>

my @pkg = 5544;

...
chomp($username);

XRC::changePkg($username, @pkg);

<offerIDs xsi:type="types:ArrayOfInt">5544</offerIDs>

<faultstring>org.xml.sax.SAXException: Found character data inside an 
+array element while deserializing</faultstring>