Function Module

General-purpose function. Function modules are external subroutines written in ABAP. Developed in the Function Builder, they are managed in a central function library, and can therefore be called from any ABAP program. This helps to avoid redundant code and makes the programming process more effective. In contrast to FORM routines, function modules have the same standard interface.

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分隔线上面是 SAP 标准文档中提供的说明
分隔线下面是我的翻译
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用于一般用途的函数。函数模块是用 ABAP 编写的外部子程序。在函数编辑器中开发,在一个中央函数库中管理,并且可以从任何 ABAP 程序调用。这帮助避免冗余代码并且让编程过程更加高效。跟 FORM 子程序相比,函数模块具有相同的标准接口。

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