Note the following information when you are checking out rules:
A checked-in rule version can have validation errors, which can occur when ruleset prerequisites change or a referencing rule is relocated. When you perform a standard checkout, the validation errors appear in the rule form header. You must resolve all errors and save before you can check in any new changes.
You cannot check out a base rule when you or another developer has a circumstance version checked out.
Application
Class
Ruleset version
Library
Agent
System setting