BTE - Difference between P/S interface & Process Interface

- Publish and Subscribe Interface

Means the Event FM only provides the Document number or anything that is coming in the FM Import interface in order to trigger some other external process. You have no vontrol on changing SAP code from this FM. You can just use that info and do additional tasks outside of that SAP process

（只有 import 参数，用于存储用户的Z table）

- Process Interface

Means that Event FM provides both Import and changing parameters which allows you to take control of the process and influence what the changing parameters values are going to be used once the control returns back from this FM back to its caller.

（有import， export，changing 参数，可以改变 SAP 标准程序的数据）