In all event subscribers we created in this chapter, subscription was activated as soon as the Subscriber function was saved and compiled. But this is not necessary; subscription can be started manually by C/AL code. Now, we will see how to activate subscription on demand.
This example will subscribe to a custom event raised on the creation of a general journal line from a customer payment record. We will use it to show a progress bar window with the number of processed lines. Event subscription will help separate the user interface (progress window) from the line-processing code, and enable the window when needed simply by activating the subscription.
Journal lines are created in codeunit 50504 Customer Payments ...
