For the forms of all Yapla applications, you can configure the fields to ensure that there are no duplicates. Once the field is configured this way, the values entered in the field must be different from the ones previously submitted.
This option can be used, for example, to prevent a person from registering for an event twice.
Where to configure the prohibition of duplicates?
In the "Form" tile of an application, select the "Fields" tab.
Select an existing field or create a new field.
In the field configuration, check the "Do not allow duplicates among all the elements" checkbox.
Once the option is checked, the field will have to contain a different item from the previous ones in order to save the form containing the field.