Dynamic change of fields in Module Pool program?

Dear Friends,
I defined a check list with values ABC and 123.
If I select ABC, there are 4 fields will be displayed these all are char fields.
If I select 123, there are 4 fields are replacing the above mentioned 4 fields at runtime. In that, one  Date field is there, but it is replacing with char value.
How can I change dynamically from char to date vise versa at runtime?
PLease help me out.
thank you
sekahr

FM for converting char to numc : CHAR_NUMC_CONVERSION
for numc to char CALL FUNCTION 'MOVE_CHAR_TO_NUM'

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    regards
    surender

    Hi
    This component though is not attached to the screen painter, plays important role in transaction. Normally, for reports, on line executable programs are written but for transaction, Module Pool Programs are written. The module pool program contains only modules to handle various events associated with screen and data declaration statements.
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    •     Create module pool program.
    •     From screen painter create screens.
    •     Write flow logic for each screen.
    •     Write code for all the events in module pool program.
    •     Check for any error in screen and flow logic.
    •     Generate each and every component of screen i.e. flow logic and screen.
    •     Single screen can be tested using Screen Painter.
    •     Create transaction code through object browser.
    •     Generate the transaction code.
    •     User can execute the transaction by entering the transaction code in the command field.
    Handling Function Code
    The function code or OKCODE is the last field of Field list. Function code can be handled as follows:
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    •     In field list, developer needs to specify OKCODE as last field.
    •     In module program it is a global field and can be evaluated in the PAI event.
    •     A function code is treated in the same way, regardless it comes from pushbutton, menu item or any other GUI element.
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    Program YVTEST7.
    TABLES: SFLIGHT.
    DATA: OKCODE (4).
    MODULE INPUT1 INPUT,
    CASE OKCODE.
       WHEN ‘DISP’.
         SELECT * FROM SFLIGHT
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                               CONNID = SFLIGHT – CONNID.
         ENDSELECT.
         LEAVE TO SCREEN 200.
       WHEN ‘EXIT’.  LEAVE TO SCREEN 0.
      ENDCASE.
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    MODULE USER_COMMAND_0200 INPUT.
    CASE OKCODE.
    WHEN ‘BACK’. LEAVE TO SCREEN 100.
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    ENDMODULE.                    “USER_COMMAND_0200 INPUT
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    MODULE INPUT.
    Flow logic for screen 200
    PROCESS AFTER INPUT.
    USER_COMMAND_0200.
    MODULES: Modules are handled in module pool program.
    You need to write flow logic for screen 200 and design screen 200.
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    The Field Checks
    As already mentioned Transaction is the only method, which SAP recommends to update the database tables. Data entered in the database table should be valid and correct. Data entered is validated at each and every point. ABAP/4 offers various methods to validate data and those are as follows:
    •     Automatic field checks
    •     Checks performed in the flow logic
    •     Checks performed in the ABAP/4 module pool program
    Automatic Field Checks
    These checks are based on the field information stored in the dictionary. These checks are performed by the system automatically when the user enters the data for the screen field. System performs these checks before PAI event is triggered. Types of field checks performed by system are as follows:
    •     Required input
    While designing the screen, for particular screen field if you click the Req. Entry checkbox, the field becomes mandatory. When the transaction is executed if user leaves this particular field blank, the system displays error message. User cannot proceed until the user enters some data.
    •     Proper Data Format
    Each field has its own data format whether it is table field or screen field. Whenever data is entered, system checks for the proper format of the data. For example date. Each user has its own format for date, which is defined in the user master record. If the date defined in the user master record is in the format DD/MM/YYYY, if the user enters the date, say, in YY/DD/MM, the user displays the error message. System also checks for the value of month or days. For example if month entered is greater than twelve then the error message is displayed.
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    Automatic field checks are repeated each time the user enters the data.
    About at Exit – Command
    Automatic field checks can be avoided by AT EXIT-COMMAND, which works exactly the same way as Cancel works on application tools bar. In the R/3 screen, if you want to quit the processing of that particular screen without entering the mandatory fields, user can click the Cancel button. Same functionality can be incorporated in the user-defined transaction by using AT EXIT-COMMAND. This module can be called before the system executes the automatic field checks and it goes without saying that before PAI event. Code for AT EXIT-COMMAND in flow logic and in module pool program can be written as follows:
    In Flow Logic
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    Module exit AT EXIT-COMMAND.
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    Module exit.
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    Flow Logic Validations
    Consider the case where you want user to enter only ‘LH’ and ‘SQ’ for sflight-carrid. In this case, you are restricting value of a screen field. This cannot be achieved by automatic field check. Hence there is a need of additional validation. It can be done in flow logic by using following statement:
    Field -
    Values
    Syntax
    PAI.
    Field sflight-carrid values (‘LH’).
    For multiple values
    PAI.
    Field sflight-carrid values (‘LH’ ‘SQ’).
    Field sflight-price values (between 1000 and 2000).
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    PAI.
    Module  assign.
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    Module  assign.
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    Chain.
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    Module Pool Program Validations
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    •     Module statement in ABAP/4 module pool Program.
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    PAI.
    Field sflight-carrid module <name>.
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    Dynamically Calling the Screens
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    Transaction is a sequence of screens, which are displayed one after the other. The next screen displayed depends upon the attributes of first screen. In attributes you need to give Next Screen number i.e. if next screen displayed should be 200 screen, then this number should be given in next Screen attributes. These are static attributes of the screen. By default, if nothing is specified in the program, the system branches out to the screen number, which is specified in the attribute screen.
    In this case, if user selects MARA pushbutton, then fields from Mara table are displayed. When the user clicks on the MARD, then the fields from MARD table are displayed. Depending upon users selection, the screen is branched out and this has to be done during runtime. This functionality can be achieved by dynamically calling the screen in module pool program.
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    Set Screen
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    Set screen <number>.
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    Case okcode.
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              Set screen 200.
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              Set screen 300.
    Endcase.
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         When ‘LIST’.
              Set screen 300.
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    SET SCREEN 200.
    LEAVE SCREEN.
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    LEAVE TO SCREEN 200.

  • How to deactivate the screen fields dynamically in Module Pool Program?

    Hi guys,
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    Hi,
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  • Want to change the text of a coloumn dynamically in module pool program

    Hi to all experts,
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    Hi Experts,
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    Prabhudas

  • How to validate the field values in module pool program?

    Hi Guys
         I am working with module pool programming.
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         with out filling all the fields if I click SAVE option it has to show a message that all fields has to be filled.  This can be done by checking all the fields individually.
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