JBoss BPEL Editor showing error message for valid Assign activity

The assign activity is reporting an error, which only shows up in the Project Explorer view (not in the actual editor). The assign is a sample assign between two variables. The error is:

The XPath segment "child::app:Application" cannot be resolved. Test.bpel /Test/bpelContent line 45 BPEL Validation Marker

Although it shows as an error, it actually deploys and runs fine.

Have a sample project attached