Create a Unique Key
You can create a unique key to make sure that two objects cannot be saved with the same values for a set of chosen attributes.
Note:
Unique Key names shall contain alphanumeric characters and the "_" character
only.
Notes:
- Attributes can be taken from the type and/or the extension, if any. A unique key can also constraint some basic attributes such as revision, owner, originated.
- The attributes constrained by the unique key are those that are checked.
- The unique key is only applied to objects that have the type extension you specified in step 3.d. To automatically add a type extension to an object, either select true from the Automatic addition list when creating a deployment extension, or create a business rule. For more information, see Creating and Deleting a Deployment Extension and Creating a Business Rule.