MediaWiki:Wikibase-snakview-variation-nonewvaluefordeletedproperty/qqq

If the user is editing a Snak whose Property has been deleted, this warning will be displayed if tue user changes the Snak's type from any other Snak type to a value Snak. Since the Property has been deleted, there is absolutely no indication for what kind of value the user wants to enter. So this action simply makes no sense.