When you call a function module, an instance of its function group plus its data, is loaded into the memory area of the internal session. An ABAP program can load several instances by calling function modules from different function groups.
SAP R/3 refers to Systems Application and Product for data processing Real-time having a 3 tier architecture i.e. Presentation layer, Application layer and Database layer.
There are five contents in Technical Settings: Data Class, Size Category, Buffering Permission, Buffering Type and Logging.
Function Groups act as containers for Function Modules that logically belong together.
1) These cannot be defined in a Function Module.
2) It cannot be called.
3) They are containers for Function Module.
1) These must be defined in a Function Group.
2) It can be called from any program.
3) They are not containers for Function Group.
Central information repository for application and system data. The ABAP Dictionary contains data definitions (metadata) that allow you to describe all of the data structures in the system (like tables, views, and data types) in one place. This eliminates redundancy.
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