Able to resolve relative paths for imported schemas[eg:"../sample.xsd"] from a wsdl

Tried below steps with wso2 ESB 4.0.3.

1)Create a proxy service with setting <useOriginalwsdl> property as true as referring to a back-end service's wsdl which contains schema definitions as relative paths[eg: schemaLocation="../../sample.xsd"]

2)After created the proxy service ,when we tried 'wsdl validator' option,wsdl validation fails,due to un-resolvement of imported schema urls.