# Mandatory Fields

When you start adding fields to your definition, one of the first things you will probably notice is two radio buttons placed next to each other immediately after the text input field: Mandatory and None . These buttons indicate if, at the instance level, the user needs to fill the given field (Mandatory) or not (None) before saving the instance. If the Mandatory button is checked, when filling an instance of that definition, the name of the field will be followed by a red asterisk - *.


Whenever the user tries to save the instance without filling the mandatory field(s), an error message will appear on the left side of the instance window. Fields with errors will have their border colored in a dark red.

The video included below shows a practical example of this type of fields both at the definition and at the instance level: