Sorry for the cross-posting I am seeking for a quick answer and thought the forums were independent. I updated my initial post to include the link

Regarding your reply. I evaluate that option but it does not work:
1) Because too much user interaction is required, first you need to add the field and then unlink
2) Because i need multiple distinct identifiers on the same document.
3) I need the identifier to remain unchanged even when the document is changed, reopen or resaved.

The one that will probably work is “insert date time” (the static version: the date is inserted as text). Is there any way to insert it automatically along an AutoText?

Thanks for your support!