hey mate , if u have a BEY tkt and wanna go DAM that the agent would probably take the tkt and speak with the tkt sales sup to find out if DAM and BEY are in tha same zone , if yes than we would have no issues with accepting BEY tkt on the DAM route as it's the same price anyway.Cant comment on coming back , it all depends on the handeling agents there.Some dont give a damn some go by the book...