How can a custom Fixlet are created which locks the constraints and makes other operators unable to alter them?

A.
On the Properties tab of the Create Fixlet dialog, lock the action constraints beforehand.

B.
On the Actions tab of the Create Fixlet dialog, click on the Include Action settings locks.

C.
On the Relevance tab of the Create Fixlet dialog, click on the Pre-define Action constraints.

D.
On the Actions tab of the Create Fixlet dialog, select Lock Constraints from the Script Type dropdown.