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User Interaction (6.2 Messages (6.2.1 Types of Messages (A (termination…

- - - - Defines a data object in the program.
      - Defines a screen element on the selection screen.
    - - the name of parameter field para can contain a maximum of 8 characters
      - TYPE OPTIONS
        
        if no type options are specified, the default option is TYPE c with LENGTH 1
        
        TYPE data_type [DECIMALS dec]
        
        data_type
        
        a predefined ABAP type, with the exception of f and xstring
        
        a non-generic data type from ABAP Data Dictionary
        
        a non-generic public data type of a global class
        
        a user-defined elementary data type from the same program, already defined using the TYPES keyword
        
        LIKE dobj
        
        TYPE vs. LIKE
        
        TYPE is used to refer to an elementary data type, local data type in a program, or data type in ABAP Data Dictionary.
        
        LIKE is used to refer to another data object in the program.
        
        LIKE (name)
        
        supply the field reference dynamically
      - SCREEN OPTIONS
        
        OBLIGATORY
        
        NO-DISPLAY
        
        VISIBLE LENGTH vlen
        
        AS CHECKBOX
        
        can be selected by default by assigning a default value 'X' during the declaration
        
        RADIOBUTTON GROUP
        
        AS LISTBOX VISIBLE LENGTH vlen
      - VALUE OPTIONS
        
        define a default value or allow lowercase letters to be transported to the data object
        
        possible to set a search help, an SPA/GPA parameter to be bound, or a check to be executed against a value list
  - - - Range Table
        
        the content can be analyzed with the relational operator IN
        
        IF v_matnr IN rt_matnr. ENDIF.
        
        TYPE RANGE OF with DATA
        
        four fields
        
        SIGN
        
        included or exlcuded
        
        OPTION
        
        contains the relational operator
        
        LOW
        
        HIGH
    - - DATA v_carrid TYPE s_carr_id. SELECT-OPTIONS s_carrid FOR v_carrid.
        
        This code creates a range table with a header line for which the LOW and HIGH fields are of type v_carrid in the program.
    - - The MULTIPLE SELECTION dialog box includes four tabs to input selection criteria
        
        SELECT SINGLE VALUES
        
        SELECT RANGES
        
        EXCLUDE SINGLE VALUES
        
        EXCLUDE RANGES
  - - - SKIP
        
        creates a blank line
      - ULINE
        
        creates a horizontal line
      - BEGIN OF BLOCK
        
        organize the selection screen elements into multiple blocks
        
        The block is closed with the END OF BLOCK statement, and it supports defining frames and titles for the frames.
- - - - termination message
    - - error message
    - - information message
    - - status message
    - - warning message
    - - exit message
  - - - SE91
      - should be in a customer namespace, starting with Y or Z
      - MESSAGE e000(ZMSG_CLASS)
        
        the message number 000 maintained in the message class ZMSG_CLASS as an error message
      - REPORT ZDEMO_MESSAGES MESSAGE-ID zmsg_class. MESSAGE E000.
  - - - sy-uname
        
        stores the username
      - sy-repid
        
        stores the current program name