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Why do we need to code a LOOP statement in both the PBO and PAI events for each table in the screen ? We need to code a LOOP statement in both PBO and PAI events for each table in the screen. This is because the LOOP statement causes the screen fields to be copied back and forth between the ABAP/4 program and the screen field. For this reason, at least an empty LOOP......ENDLOOP must be there. The field SY-STEPL refers to ___________________ . The index of the screen table row that is currently being processed. The system variable SY-STEPL only has a meaning within the confines of LOOP...ENDLOOP processing. Outside the loop, it has no valid value. How can we declare a table control in the ABAP/4 program ? Using the syntax controls <table control name> type tableview using screen <scr no>. Differentiate between static and dynamic step loops. Step loops fall into two classes: Static and dynamic. Static step loops have a fixed size that cannot be changed at runtime. Dynamic step loops are variable in size. If the user re-sizes the window the system automatically increases or decreases the number of step loops blocks displayed. In any given screen you can define any number of static step loops but only a single dynamic one. What are the two ways of producing a list within a transaction ? By submitting a separate report. By using leave to list-processing. What is the use of the statement Leave to list-processing ? Leave to list-processing statement is used to produce a list from a module pool. Leave to list-processing statement allows to switch from dialog-mode to list-mode within a dialog program. When will the current screen processing terminates ? A current screen processing terminates when control reaches either a Leave-screen or the end of PAI. How is the command Suppress-Dialog useful ? Suppressing entire screens is possible using this command. This command allows us to perform screen processing "in the background". The system carries out all PBO and PAI logic, but does not display the screen to the user. Suppressing screens is useful when we are branching to list-mode from a transaction dialog step. What happens if we use Leave to list-processing without using Suppress-Dialog ? If we don't use Supress-Dialog the next screen will be displayed but as empty. when the user presses ENTER, the standard list output is displayed. How the transactions that are programmed by the user can be protected ? By implementing an authority check. What are the modes in which any update tasks work ? Synchronous and Asynchronous.