Blockbuster Wizzards, Spurs, Blazers

No. As long as the receiving team's cool with it (and if they're dumping long contracts or getting other assets, that's what trades are about) you can make any trade the CBA allows. Now if we were to see that Webster ripped an ACL on the last play last night, and didn't tell that to the Wiz as we consummated the Webster/Blake for Haywood deal, then they would be able to rescind for a presumably healthy player failing a physical.