delete AcronisESXAppliance from ABR10 when it was installed

Hello,

i have the same problem that here (http://forum.acronis.com/forum/12990) with ESX4
and i do like this (http://kb.acronis.com/content/2741?nocache=1)

but i have change the Centralized management for local, and i can't change again for Centralized management because the host is present in AMS but in AMS i can't do nothing with it ^^

How can i delete this host from AMS ?