Priority applies to multiple entities such as Requirements and Test Scripts, it is one of the core picklists in Enterprise Tester.
Requirements and test scripts that have a high priority for a specific project "Testing":
Project = "Testing" AND EntityType IN ["Requirement", "TestScript"] AND Priority = "High"
All the Critical and High requirements:
Project = "Testing" AND EntityType = "Requirement"AND Priority IN [Critical, High]
=, IN, !=, NOT IN