Expressions of type OBJECT, CLOB, BLOB, or XML cannot be used in comparison

This is the scenario in which we are trying to consume soap web service by using of existing WSDL and exposing it again it as web service. So when we are trying to model/ create web service out of <<Filename>>.xml in “Views” Folder (Refer screen shots attached). As a result we will get Input, output xsd’s and relevant <<Filename>>WS. xmi in “web_services” Folder.

In <<Filename>>WS. Xmi we are getting below error at ‘Operation’ level.

ERROR: Expressions of type OBJECT, CLOB, BLOB, or XML cannot be used in comparison: CustomerOrderListServiceView_Output_View.Result_Output1View.Result_Output1.Result_Output1_Instance.xml_in = convert(VARIABLES.IN_XML_IN, xml).

So please give me any solution do you have for this.