in the most current version (3) of org-ref, the labels that are found are defined in org-ref-ref-label-regexps. At the moment there isn't a pattern for ID. No particular reason, I haven't used ID like that for many years. I added and pushed that to the current repo just now.

John

-----------------------------------
Professor John Kitchin (he/him/his)
Doherty Hall A207F
Department of Chemical Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
412-268-7803

@johnkitchin
http://kitchingroup.cheme.cmu.edu

On Wed, Nov 17, 2021 at 11:55 AM Uwe Brauer <oub@mat.ucm.es> wrote:

Please look at this example

* new
:PROPERTIES:
:ID: 43b3de77-4074-47f2-9a4a-9cddebb33951
:END:

** Inverse problem
:PROPERTIES:
:CUSTOM_ID: sec:one
:END:

** new title
:PROPERTIES:
:ID: f3c76e50-5be9-47f2-bad4-257166670481
:END:

Two ids were generated by org-id-get-create. I thought that could be
another solution to my problem.

However, strangely enough org-ref-helm-insert-ref-link
does not find these two IDs it only finds CUSTOM_ID.

@John: you are the author of that package, why doesn't the function find
the ID?

Regards

Uwe