//Artefact:ModelClass/org/uml/stereotypes/associationends/StrictlyOwned

With respect to a StrictlyOwned association the other end items belong to a single and fixed owner class. They can only be created and assigned, but not selected from. The owner does not change during their life cycle.

Note that this association stereotype only guarantees the non-selectability property when editing the container class. It does not disable the editor page for the target class. For that, you need to apply appropriate stereotypes to that target class, too.