Unique

The Unique property prevents the duplication of current content across entries in a content type.

Note: The Unique property works only for content types with “Multiple” entries.

When you add a field to a content type and set it as Unique, that field will only accept non-duplicate values. If a user enters an existing value, they will get a prompt to change the duplicate value.

Note:

If a field is marked as Multiple, then the Unique property will not be applicable.
You can save the entry even if non-mandatory fields that are marked as “Unique” are left empty.

More articles in "Field Properties"

About Field Properties

Display Name

Unique ID

Placeholder Value

Instruction Value

Help Text

Default Value

Validation (Regex)

Validation Error Message

Mandatory

Multiple

Minimum and Maximum Limits

Non-localizable

Managing Non-Localizable Fields

Show as Tab

Number of Characters

Allow images only

Allowed file type(s)

File size limit

Set date range

Mark as Group Title

Selection Type

Limit for Multiple Choices

Display Type

Choice Data Type

Add Choices

Image Dimension Validation

Config Parameter (for Custom Fields only)

Referenced Content Type

Select Extension/App (for Custom Field only)

Select Taxonomy

Maximum Number of Terms