In AC21, there is the
Element ID, which is the ID you set in the ID field of the Element Settings Dialog. (This was called "Compact Element ID" in previous versions, and it WAS available as a Field for Schedules).
There is the
Hotlink Master ID, which you can set in the Settings Dialog of a selected Hotlinked Module. (This was called "Master ID" in previous versions, and it WAS NOT available as a Field for Schedules. You could display it in certain Labels such as the "Generic Label 20" or the "Identification and Property Label 20" Label.)
Then there is the
Hotlink and Element ID, which is the result of the concatenation of the Hotlink Master ID and the Element ID. (This was called "Full Element ID" in previous versions, and it WAS available as a Field for Schedules).
The "Hotlink and Element ID" feature enables you to have Unique IDs for elements coming from Hotlinked Modules placed multiple times in the Project.
In AC21 all three are available for Schedules as Fields. The "Hotlink Master ID" and "Hotlink and Element ID" fields are not editable because they are settings of Hotlinked Modules, not settings of Doors/Windows, and the Door/Window simply inherits them. Also, in case of an element coming from a Hotlinked Module, the "Element ID" field will not be editable either in the Schedule.
For element not coming from Hotlinked Modules, the "Element ID" field is editable and when it is edited, its "Hotlink and Element ID" field will update automatically based on its changes.
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