Actions that you do in the subledger (eg Validate Invoice) raises an event to SLA this is analogous to buying tickets online for a show that will be used at a later time and being held for you at the venue.

1. Event Class = choosing what type show  eg Movie or Concert or Live Theatre (Invoice, Payment, etc)
2. Event Type = the specific show you want to go to within the event class – eg Movie, Indiana Jones and the Temple of Doom (Validate, Cancel, Void, etc)
3. Event ID =  Once you have chosen and bought the ticket you are given a confirmation number

Running Creating Accounting is showing up to the venue and giving your confirmation number to the ticket booth.

The ticket taker looks up the confirmation number to determine what exact show you want to see and to determine if you want food/drinks and where you are going to sit,  she also needs to know some attributes about you based on your national identification number (NIN).

Based on the NIN they can find other information about you, your food/drink and seating preferences and also what you are allowed to choose from.

Indiana Jones is playing at 4 theaters, based on the NIN you are directed to the theater that has been assigned to your NIN and the which section, row and seat you sit in.  You are allowed popcorn but not butter, no soda but wine or water is ok.

The Create Accounting program determines how to process the event ( confirmation_number) and based on the ledger (NIN).  The SLAM is attached ot the ledger (ie rules assigned to NIN).  The event determines the event class/type (movie/indana jones) and additional information (sources) is gathered about the specific transaction being processed.  The SLA rules determine which journal lines/ accounts/description are generated ( which theater, row, seat, food options).

The NIN is the Ledger, the rules assigned is the SLAM,  the AAD is which theatre, JLD Section, JLT Row, ADR Seat.