Under leaving the battlefield it states "if at any time a unit leader ends it's movement with any part of it's base outside the battlefield that unit is defeated"
However under movement it says " if a unit leader performs a move that causes any part of it's base to leave the battlefield that unit is defeated".
Example a t-47 airspeeder does it's complusory move by angling the template he is able to finish on the board but the movement would cause at least part of his base to leave the battlefield