I have two Pega 7.1 environments: DEV and TEST.
Once, I developed a RuleSet 01-02-02 on DEV and deployed it on TEST.
After this, instead of creating the new RuleSet version I unlocked 01-02-02 RuleSet and added a new Rule there. Then I deployed it on TEST, but I didn't find the new Rule on 01-02-02.
Then I decided to delete this RuleSet 01-02-02 on Test and just install last fresh package. So, I deleted it.