What is PBO Event?
PBO (Process Before Output) determines the flow logic or execute modules before displaying the screen. This event is used for displaying the fields from the program to the screen. User can build the GUI status in PBO.
What is PAI Event?
PAI (Process After Input) determines the flow logic execute modules after the display of the screen and after receiving inputs from the User. This event is used to write the code for the User actions on the screen. In PAI data moves from screen to program.
在SAP屏幕成中有两个事件，一个是PBO事件，一个是PAI事件。
PBO事件
PBO在屏幕显示之前决定了逻辑流和执行模块。此事件是用于从程序到屏幕显示字段。用户在POB种会用来建立gui状态.
PAI事件
PAI是确定在屏幕显示和收到用户输入后的逻辑流执行模块。此事件是用户在屏幕上操作写代码。在PAI中，数据从屏幕到程序。