SAP_ABAP_按顺序举例说明Report各事件及其作用

本文详细介绍了ABAP编程中常见的事件类型及其触发时机,包括程序执行、初始化、选择屏幕输出及行选择等事件。

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1、LOAD-OF-PROGRAM 程序执行时,自动触发该事件
2、INITIALIZATION 初始化
3、AT SELECTION-SCREEN OUTPUT 选择屏幕PBO事件,显示选择屏幕之前触发
4、AT SELECTION-SCREEN 选择屏幕PAI事件,在选择屏幕上执行功能时触发
5、START-OF-SELECTION 数据选择行开始
6、END-OF-SELECTION 数据选择行结束
7、TOP-OF-PAGE 页眉控制
8、END-OF-PAGE页脚控制
9、AT LINE-SELECTION 行选择控制,用户选择或者双击某行时触发
10、AT USER-COMMAND用户交互控制,用户选择某个GUI功能时触发。

### SAP ABAP SD Module BAPI Usage and Information In the context of the Sales and Distribution (SD) module within SAP systems, Business Application Programming Interfaces (BAPIs) play a crucial role in facilitating external access to business logic and data. These interfaces allow non-SAP applications like VB or Java to interact with SAP functionalities through registered business objects that reside in the Business Object Repository (BOR)[^1]. For instance, when dealing with sales orders—a core component of the SD module—specific BAPIs exist for creating (`BAPI_SALESORDER_CREATEFROMDAT2`), changing (`BAPI_SALESDOCUMENT_CHANGE`), displaying (`BAPI_SALESDOCUMENT_GETDETAIL`), and canceling (`BAPI_SALESORDER_CANCEL`) sales documents. Here is an example demonstrating how one might use `BAPI_SALESORDER_CREATEFROMDAT2`, which creates a new sales order from provided input data: ```abap DATA: lt_return TYPE TABLE OF bapireturn, ls_header TYPE bapisdhd1, lt_items TYPE TABLE OF bapisditm, lv_order TYPE vbeln. ls_header-parnr = '000000008'. APPEND INITIAL LINE TO lt_items ASSIGNING FIELD-SYMBOL(<item>). <item>-matnr = 'MAT123'. CALL FUNCTION 'BAPI_SALESORDER_CREATEFROMDAT2' EXPORTING headerdata = ls_header IMPORTING salesdocument = lv_order TABLES itemin = lt_items return = lt_return. ``` This code snippet illustrates initializing necessary structures for headers and items before invoking the BAPI function module responsible for generating a new sales document based on given parameters. After execution, it returns either success messages along with generated identifiers or error details depending upon whether creation was successful. Additionally, another important aspect involves handling returned values effectively after calling these functions; this includes checking status codes stored inside tables passed via parameter lists such as `lt_return`.
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