## Context
An object should always have a labelIdentifier (would be its primary key
at least). If the associated field is deleted by a user, it will break
the app. Ideally we should handle that on the DB level but we don't have
a FK for this column yet.
In the meantime I'm adding the validation check in the backend, note
that this is already handle on the FE side since the "archive/delete"
buttons don't appear for such fields so you need to reassign it to
another field first which is the desired behaviour.
Weiko
a374922902