I have a multi domain configured that contains CX4-120 and 5100 and 5300, with the 5300 as the Domain Master, I have tried to add in a 5400 to this domain and keep the 5300 as the domain master but I get unsupported in the system status field, will I have to create the 5400 as my domain master and move all the others, or is there some workaround for this