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Sub routines do not return exceptions. Sub routines cannot be tested independently. Declaring data as common parts is not possible for function modules. Function modules are stored in a central library. What is a function group? A function group is a collection of logically related modules that share global data with each other. All the modules in the group are included in the same main program. When an ABAP/4 program contains a CALL FUNCTION statement, the system loads the entire function group in with the program code at runtime. Every function module belongs to a function group. What is the difference between internal tables and extract datasets? A. The lines of an internal table always have the same structure. By using extract datasets, you can handle groups of data with different structure and get statistical figures from the grouped data. B. You have to define the structure of the internal table at the begining. You need not define the structure of the extract dataset. C. In contrast to internal tables, the system partly compresses extract datasets when storing them. This reduces the storage space required. D. Internal tables require special work area for interface whereas extract datasets do not need a special work area for interface. LOGICAL DATABASE. What are logical databases? What are the advantages/disadvantages of logical databases? Ans :- A Logical Database is a hierarchical structure of tables. Use the GET statement to process Logical Databases. - LDB consists of logically related tables grouped together н used for reading and processing data. - Advantages = 1. No need of programming for retrieval , meaning for data selection - 2. Easy to use standard user interface, have check completeness of user input. Disadvantages = 1. Fast in case of lesser no. of tables But if the table is in the lowest level of hierarchy, all upper level tables should be read so performance is slower. Preparation of the data records by the L.D.B and reading of the data records in the actual report are accomplished with the command pair. - Put and Get. The three main elements of LDB are - Structure, Selections, Database Program. What sort of tables one can use in designing the hierarchy of a LDB ? - Tables which are having Foreign key relations.