G/L accounting and accounts receivable/payable accounting provide publish and subscribe interfaces, which inform other application components or external interested parties (partners, customers) that particular events (such as document entered) have taken place in financial accounting. The data this creates can be used by the interested parties for their own subsequent processing. But no data can be returned to G/L accounting or accounts receivable/payable accounting.

When a Business Transaction Event occurs the system calls a function module which creates the BOR event. To do this, this function module "converts" the data from the Business Transaction Event into the format suitable for the event and creates the appropriate event for the Business Transaction Event. The function module hence has a parameter interface and implementation which are appropriate for the Business Transaction Event.

For every Business Transaction Event that can be linked to an event, SAP provides a suitable function module with appropriate interface and implementation. The following relationships are currently possible: