Attribute type checking on field with @Converter

I've created custom type for entity field and made a @Converter for it, But Idea 13.1 claims about 'Attribute type checking'

I created a test project on github.

Is it my fault or Idea does not support this feature of JPA 2.1?

13.1.1 IntelliJ IDEA 13.1.1

Build #IU-135.480, built on March 21, 2014

JRE : 1.7.0_51-b13 amd64

VM: Java HotSpot(TM) 64-Bit Server VM by Oracle Corporation