Hi gus, pls i need ur help.
i create an object(house) with the checkox(available) and object (client)

The house (available) field should be set to TRUE by default.

If i did it right , i set true in the  Autom.process - Business rules 

If house has at least on prospective client, checbox(Available) must by changed to FALSE automaticaly
How can i do that?