Should Liam Manning be allowed to leave Oxford Utd to go to Bristol City?

Breaking news today that Liam Manning is to leave Oxford Utd to go to middle of the league, championship side, Bristol City. He takes with him his assistant manger from the club, Chris Hogg but should he be allowed to be so mercenary? Manning like Karl Robinson following a sacking from the MK Dons moved to then close to relegation side, Oxford Utd. Within 8 months, Manning has turned Oxford around to be placed in an automatic place making him a highly sought after manager. Some supporters feel Manning should not be allowed to so easily leave the club and that he should stay to complete the promotion race job. Managerial contracts should not allow a manger to exit so early from contract obligations by simply paying up early leaving fees. Manning is not without controversy. In his recent match with Wycombe, he was banned from for one match following excessive side line protests against the referee after he awarded two penalties to Wycombe forcing a 2-2 draw.