"Borrowing Credits" addenda/redline?

Hi all, Seems as though a lot of people have similar questions about "borrowing credits" from other rating systems. I think that I've tracked down that line of logic: You can use v4 of this credit in a 2009 project, and v4 allows you to borrow credits from other systems (pg. 781 of current BD+C v4 guide). That said, this is where the logic sort of ends for me, since the text in the v4 guide reads: "Points can also be earned by achieving selected credits from other LEED rating systems." The implication here is that there is an approved list (i.e. "selected credits") that exists somewhere, but I can't find any evidence of such a list's existence. Is there an approved credit-from-another-rating-system list somewhere out there, or will they be approved strictly on a project-by-project basis? Thanks in advance! Jake