metadata fields from dc metadata registry cannot be added to items

[Erica Johns]

hi all- 

(posted in slack too, apologies for duplication. hoping to get some eyes on this!)

in the middle of our migration to 7 (launch on friday ) and something surfaced that we missed before: we do a lot of metadata editing of items in the UI after upload, and currently metadata fields that already exist in our dc metadata registry (migrated over from DS6) cannot be added to items when editing metadata, instead you get an error that says "Please choose a valid metadata field". 

I can create altogether new fields in the registry and then add them to items just fine.

TLDR: adding dc.format (a field that comes default with DSpace and is in our dc registry but not a default field for each item display) results in an error, but adding dc.bagels (a field I just added to our metadata registry) works perfectly. can someone advise?

note: I tried to add "organization.identifier" (an out of the box field in DS7 intended for configurable entities) to an item and it threw the same complaint/failure as our migrated, desirable fields. 

please advise! 

Erica