Object ID as a option to AvantCommon plugin

Hello. I wish use AvantRelationship plugin. By default, AvantCommon use identifier (metadata Dublin Core) as identifier element (to relate items), but I would like to use Object ID instead.
What should I modify to uses Object ID?

Thanks for your answer.

On the AvantCommon plugin configuration page, specify “Object ID” as the Identifier Element (the first option). I am not certain that this will work, but try it and then please reply to us know.

Hi. I tried but this message is displayed:

The message is telling you that Object ID is not an Omeka element on your site. You’ll need to add Object ID as an element before you can specify it in the AvantCommon configuration.

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Which Omeka file needs to be modified to add Object ID? Thanks a lot.