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- Update transaction ( or "SAP LUW") This is a set of updates terminated by an ABAP/4 commit. A SAP LUW may last much longer than a database LUW, since most update processing extends over multiple transaction screens.The programmer terminates an update transaction by issuing a COMMIT WORK statement. Does the external program run in the same SAP LUW as the caller, or in a separate one? - Transactions run with a separate SAP LUW - Reports run with a separate SAP LUW - Dialog modules run in the same SAP LUW as the caller - Function modules run in the same SAP LUW as the caller The only exceptions to the above rules are function modules called with IN UPDATE TASK (V2 function only) or IN BACKGROUND TASK (ALE applications). These always run in their own (separate) update transactions. What are the requirements a dialog program must fulfill ? - A dialog program must fulfill the following requirements . a user friendly user interface . format and consistency checks for the data entered by the user . easy correction of input errors . access to data by storing it in the database. What are the basic components of dialog program ? - Screens (Dynpros) Each dialog in an SAP system is controlled by dynpros. A Dynpro consists of a screen and its flow logic and controls exactly one dialog step. - ABAP/4 module pool Each dynpro refers to exactly one ABAP/4 dialog program. Such a dialog program is also called a module pool, since it consists of interactive modules. What is a dynpro ? What are its components ? - A dynpro (DYnamic PROgram) consists of a screen and its flow logic and controls exactly one dialog step. - The different components of the dynpro are: Flow logic: Calls of the ABAP/4 modules for a screen Screen layout: Positions of the texts, fields, pushbuttons, and so on for a screen Screen attributes: Number of the screen, number of the subsequent screen, and others Field attributes: Definition of the attributes of the individual fields on a screen What is screen flow logic? What are the selections in it? Explain PAI and PBO? Ans - Screen flow logic contains the procedural part of a screen. The screen flow logic is like an ABAP program in that it serves as a container for processing blocks. There are four event blocks, each of which is introduced with the screen keyword PROCESS: