The Out of the Box (OOTB), or default, functions in CA Performance Management such as Monitoring Profiles, Metric Families, Vendor Certifications and Threshold Profiles or Event Rules are locked and will not allow user edits.
These are configured this way to provide examples for later customization to better suite the needs and requirements of a given environment.
In some instances, application of the defaults will cause unwanted behavior.
In some instances excessive or unwanted Events, or Events with severity configurations that don't meed an environments needs might be raised.
In some instances those Events can be synchronized to integrated applications like CA Spectrum, potentially raising concerns that are unwarranted.
All supported CA Performance Management releases
Create a copy, or a new custom entry, to host the desired changes.