A custom attribute has been created in the "Action Item" object. This attribute has been displayed in the [Layout:Create], [Layout:Edit] of the Action Item Properties page, in addition to [Layout:Edit] of the Action Item Details page. However, it is noticed that the custom attribute is not editable in the "Action Item Details" page.
Action Items can be of Type = Personal or Type = Process. If an Action Item is created from the UI manually, then it is assigned Type = Personal. If an Action Item is triggered from an Action of a process, it is assigned Type = Process.
Action Items of Type = Personal have an "Edit" button at the bottom of the page, in the "Action Item Details" page. This button is not available in Action Items of Type = Process.
The "Notes" tab in the Action Item Details page can be used to make any comments on the Action Item.