As you centralize common rules, you might find that some rule attributes are no longer referenced from other calculations and can be removed from your rule set (as part of a "decluttering" exercise).
CER includes support for reporting rule attributes which are not referenced from any other calculations in your rule set and thus are candidates for removal. You can also use the CER Editor to delete any rule class and rule attribute. See Technical View.
To run the CER unused attribute report, see Unused rule attributes.