To suppress the display of the input field on the selection screen, you use the following syntax:
PARAMETERS p ...... NO-DISPLAY ......
Although parameter p is declared, it is not displayed on the selection screen.
If the parameter belongs to the standard selection screen, you can assign a value to it either by using the DEFAULT addition when you declare it, or during the INITIALIZATION event. If you call the executable program using the SUBMIT statement, the calling program can also pass the value.
When you use user-defined selection screens, you can assign a value to the parameter at any time before calling the selection screen.
If you want to display a parameter only in certain cases, for example, depending on the values entered by the user in other input fields of the selection screen, you cannot use the NO-DISPLAY addition. If you use NO-DISPLAY, the parameter actually is an element of the interface for program calls, but not an element of the selection screen. As a result, you cannot make it visible using the MODIFY SCREEN statement.
To hide a parameter that is an element of the selection screen, you must declare it without the NO-DISPLAY addition and suppress its display using the MODIFY SCREEN statement.