When auto-numbering is enabled for the Action Item object, auto-number is populated into the Action Item Subject (name) field. It does not use an ID or CODE field. Why is this different from the way that auto-numbering works on other objects?
The use of Auto-Numbering on the Action Item Object does not work like other objects. Since the Action Item Object does not have an out-of-box 'Action Item Code' attribute, the system is populating the Action Item Subject field with the auto-number value. The Action Item Subject field is not restricted and non-unique values can co-exist. If you manually create an Action Item with a Subject that may exactly match the value generated by the Auto-Numbering, the system does not indicate that a previous record already exists. Also, since the Subject field is now being used for the Action Item Auto-numbering, the end-user does not have this field available for entering a subject. This is the current design of the Action Item Object and how it behaves.
Component: Clarity Studio
If you want to use Auto-numbering in the Action Item Object you can use the following steps to create your own custom attribute and turn on the auto-number on that attribute:
Once you do this, you can update some views and portlets to reveal this custom attribute throughout the application.
You can update the Action Item Object Views:
You won't be able to modify the configuration of the Action Items (calendar.myActionItems) portlet since this is a System-Restricted Portlet.
You won't be able to modify the Organizer: Action Items portlet as this portlet is not available for configuration.