This issue was also present in BBGM Classic, but the Check-out feature meant that in effect, you could lock the document itself.
There is no Check-in/Check-out facility in SKY. In Classic, a user can check out a document, and it is possible to see who has the document checked out. Once a document is checked out, other users are unable to use the Edit button to alter the document.
You can Lock a document record in SKY, but:
Locking a document does not prevent the document record being edited
Locking a document does not prevent somebody from replacing the existing document
Anybody can unlock a document record
You cannot see who has locked the document record – this is necessary in the absence of the Check-out feature, in which you can see who has a document checked out.
Agree locking the document does not allow editing and view as checking out did. I would bring back check in check out.