From Table Control - edit form or add form - boolean to indicate which mode
Instead of making two forms, for logic that is required in Add, but not in Edit (or vice-versa), most of the time just one form is necessary to edit a record in a table control.
There should be a way to select in which mode the form has been called, that when doing Action & Validation, we can select this mode which is a boolean.
On the form, we can make an attribute or label visible or not based on this boolean.
In a script, we can code against this boolean.
Or, simply, allow OnEnter script, since we already have OnExit (but it is called validation).