Does anyone know if you can add a read-only field for the System Field REL_END_DATE to all Requirements? I'm trying to pull in that value for the specific Release a Requirement is assigned to. Changing the assigned Release in the Requirement would then update that field automatically, based on the newly assigned Release End Date.

It is a system field, but going to Tools > Customize > Project Entities won't let me add a System Field to a specific module. My only option is to add a User Field, but that doesn't let me modify the Field Name to REL_END_DATE.