ACL - How do they work?

Hi Guys, in the form of new phone ticket I would limit the choice of 
services depending on the type of ticket.
I added this ACL in config.pm but does not work
$ Self-> {TicketAcl} -> {'ACL-1'} =
{
Properties => {
Ticket => {Type => ['Incident'],},
},
Possible => {
Ticket => {Service => ['CPS-IMAC :: Add', 'CPS-IMAC :: Change'],},
},
};
work when I go to the ticket zoom I see only the services of ACL?
Suggestions?
Where can I find a complete documentation about the syntax and sematics 
of ACLs?

Thank you!

-- 
Rocco Tocci
Application Architect
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