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What is the purpose of the MODIFY command when performing the dynamic screen modifications? Ans :- after you activate or deactivate the field attributes by assigning them 1 or 0, you save the modifications via MODIFY SCREEN command. Direction for the use of check box and radio buttons in screen painter? Ans :- Creating Radio Button and Check Boxes on the screen Go to the full screen editor. Place an underscore at the point where you want to place the field. Define the name of the field using <Field Attributes> Place the cursor on the field and press <Graphic element> Then press <Radio Buttons> or <Check boxes> depending on which graphic element you want Then you group related check boxes and radio boxes. What are user Exits and transactions? Ans :- Generally, user exits are the forms defined within SAP standard code (usually starting with user exit). These predefined areas in the code allow programmers to insert custom defined code into the standard processing of a transaction (e.g. allow resorting of the batch sequence in VA01 batch processing). There are many specific examples if you are interested, but usually user exits are searched for when a specific use is being analyzed. What happens if you enter 0 in NEXT Screen attribute? Ans :- It does not go to any other screen and it moves back one level. However you can control this in run-time using SET SCREEN command. How to modify the attributes of screen fields at run time ?. We loop through the fields of the screen. When you find the name of a screen field you want to modify, set attributes for the field and use MODIFY SCREEN to update the attribtes. You can find the attributes in the internal table SCREEN. This loop makes some of the screen fields invisible ind a selection screen: AT SELECTION-SCREEN OUTPUT. LOOP AT SCREEN. IF screen-name = 'P_VERAB' OR screen-name = 'P_STXT1' OR screen-name = 'P_STXT2' OR screen-name = '%_P_VERAB_%_APP_%-TEXT' OR screen-name = '%_P_STXT1_%_APP_%-TEXT' OR screen-name = '%_P_STXT2_%_APP_%-TEXT'. screen-active = '0'. MODIFY SCREEN. ENDIF. ENDLOOP. How to leave dynpro allthough required entry not made ?