12-15-2009 08:38 AM
12-15-2009 12:02 PM - edited 12-15-2009 09:44 PM
Filters are defined as part of the Entity definition.
Expand the Entity in AA Project Explorer, Look for the Filters sub-folder.
There is some guidance in the AA Help, also useful to inspect the filters for other Entities to see how a few of the trickier Filters are composed.