Determining Transaction Success

I have a method in VB6 and SBO verstion 6.5 that needs to execute after a successful transaction takes place. For example, if a user is entering an AR Invoice, and they have fixed all errors handled by the Application, the AR Invoice is successfully posted to Business One and the process is complete. It is at this point that I need to trigger my method. I've not been able to determine to proper event to capture to do this. What have you guys found to be the best way to accomplish this?