AADSync configure attribute filtering

Hi all, I installed the last release of AADSync (1.0.470.1023)

I tried to configure filtering by attributes as on Technet

http://msdn.microsoft.com/en-us/library/azure/dn801051.aspx#BKMK_ConfigureOrganizationalUnitBasedFiltering

I would like only synchronize users for which the attribute extensionAttribute13 equal to O365

Regarding the "Inbound filtering" part the attribute cloudFiltered should be set to True when the object should not be synchronized to Azure AD and kept empty in other cases. This method is used when we can look at an object and say that we do not want to synchronize an object (negative filtering)." This solution doesn't work. When cloudfiltered is kept empty there is an error "Object reference not set to an instance of an object"

Someone had an idea ?

Thanks