In fact, the document library are the same even if you're in a team site or in the Record Center. The difference between those document library is that the ones from the Record Center is having a Submarine workflow who is doing the Metadata mapping with the files coming from the DM. I suppose that this workflow is changing the rules when i'm promoting fields into this document library.
Any suggestion ? I plan to develop a custom EHandler to recreate an existing functionnality. Its sad !
Thanks!