Autocomplete entity reference - Required to select entity I'm having problems with a required field that is an entity reference. This is my case:

I have a content type advertisement that has an entity reference product, what is an autocomplete widget. The entity reference is a required field (so when it's empty you have to fill something in).

When you start to type in the text field you get a list of suggestions to select from. But you can also type some text and DON'T select a suggestion, the form will submit and the content will be created. I don't want that. I would like to create an error that when you don't select one from the list you receive an error.

What happens when you don't select a suggestion: the advertisement is created but the product is empty!

Is there a way that I can create an error when you don't select one from the list?
Are you sure you are using the Autocomplete widget or are you using the Autocomplete (Tags Style)? I believe tags style allows for an entity to be created like taxonomy term.