CTRL+Z permissions in JCR

Hi masters!

I've author users who have access to /content/somepath to manage pages. I've created my own author role, which has Read/Modify/Create/Delete permissions on this path.

But my authors can't do CTRL+Z to undo changes. I think this behavior is due to missing permissions. I've reviewed the ootb 'content-authors' role, but I can't see any special path in the JCR to enable the CTRL+Z feature for this author users.

Could you help me?

Thank you very much!