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DESCRIBE TABLE <itab-Name> LINES <variable>

來源：

Function  'CONVERSION_EXIT_ALPHA_INPUT'

CALL FUNCTION 'CONVERSION_EXIT_ALPHA_INPUT'
    EXPORTING
      INPUT = tex
    IMPORTING
      OUTPUT = tex.

Input : Char

作用：標記一個group, 之後再使用selection-screen的dynamic modification

• SELECTION-SCREEN COMMENT
• SELECTION-SCREEN ULINE
• SELECTION-SCREEN PUSHBUTTON
• PARAMETERS
• SELECT-OPTIONS

來源：

˙PBO：Process before Output, modules are executed before displaying a screen, used to display the fields from the program to the screen, and we build the gui statuses in this PBO

˙PAI：Process After Input, modules are executed after inputting any value on a screen, used to write the code for the User actions on the screen, here data moves from screen to program.

˙常用專用變數說明
系統內部專門創建了SYST這個STRUCTURE,裏面的欄位存放系統變數,常用的系統變數有:

˙基本資料類型