What is the difference between subroutines and function modules

The components of a class are called data members. The class provides the flexibility to assign visibility to all its data members. Every instance or objects have unique identity and has its own set of values for the attributes. A class can inherit another class and interfaces. You can read more about classes here. Save my name, email, and website in this browser for the next time I comment. This site uses Akismet to reduce spam. Like executable programs type 1 and module pools type M , function groups can contain screens, selection screens, and lists.

Skip to content. Report a Bug. Previous Prev. Next Continue. Home Testing Expand child menu Expand. SAP Expand child menu Expand. VFunction groups are containers for function modules. When we call a function module, the system loads the whole of its function group into the internal session of the calling program. VThe name of a function group can be up to 26 characters long. This name is used to create the components of the group. When you create a function group or function module , the main program and corresponding include programs are generated automatically.

VThe following diagram shows the structure of a function group. These includes contain the actual function modules. For example, if you have a set of function modules that all use the same internal table, you could place them in a function group containing the table definition in its global data. It tells you how you can pass data to and from the function module, and which errors it handles. These must be supplied with data when you call the function module, unless they are flagged as optional.

You cannot change them in the function module. These pass data from the function module back to the calling program. Export parameters are always optional. You do not have to receive them in your program. They can be changed in the function module. The changed values are then returned to the calling program. You use these to pass internal tables.

However, you can also pass internal tables with other parameters if you specify the parameter type appropriately. The calling program checks whether any errors have occurred and then takes action accordingly. Paste the line as the first line in the Main Program. Press back Button 6. Press Cancel Button 7. Function modules are stored in a central library.

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