Most of the item and skill restrictions and common mapflags were joined altogether in a single file for better understanding of the user. All of them are right now in the db/re/map_zone_db.conf file. Some documentation is available right there on the same file.
What you have to do is finding the Battlegrounds zone (in the line 165 assuming that's an unchanged file and look for the MO_BODYRELOCATION skill restriction in there, which is in line 173. You just have to comment and/or remove that line and reboot your server for the changes to take effect.
