You can define rules for the validity of Records. Users won't be able to save a Record that does not follow the validation rules. You can base the validation rules on the fields of your Form or on a specific Formula. Writing a Formula for a validation rule allows you to set more advanced validation rules.
- A field with validation rules can be a Key field.
- A field with validation rules can be hidden.
- A field with validation rules can also have relevance rules.