Schema compliance assertion for REST test request

Hi,

I am using SoapUI 3.0.1. Created a new project from WADL. SoapUi is able to load the WADL and schema successfully. Now I have added some testcases with "Schema Compliance" assertions. However, it seems that these testcases always pass.I have made some changes in the service and but haven't updated the schema. So schema compliance should fail but it is not.

Any idea?

Thanks,
-Rakesh