These fields were showing up in DFFS Backend 188.8.131.52 but since upgrading to DFFS Backend 184.108.40.206 they are not shown in the Field listing and hence are not available in the Tab choices (see attachment). The fields still appear in the SharePoint display form as I have not re-saved the form from the back end.
How can I get these associated lookup fields to re-appear in the DFFS back end?
I re-saved all forms (Display, Edit, New) in the DFFS Backend version 220.127.116.11 and eliminated the cross-version last saves. Now all associated fields appear in the Fields list and I can use them in the Tab selection. Working as it should. No further action needed.