Making Mandatory fields on Screen and vice versa

Question

Hi,
I've developed a screen on which i've a field say X. Initially when the screen is shown the field is not mandatory as user may or may not enter its value.
But when he enters its value, then i've to make field Y and field Z mandatory also.
For this in PBO i've called a module which would make the necessary screen change.
    LOOP AT SCREEN.
      IF X IS NOT INITIAL.
        IF ( screen-name = 'Y' OR
             screen-name = 'Z' ). 
          screen-required = '1'.
        ENDIF.
      ELSE.
        IF ( screen-name = 'Y' OR
             screen-name = 'Z' ). 
          screen-required = '0'.
        ENDIF.
      ENDIF.
        MODIFY SCREEN.
    ENDLOOP.
Though the above code makes the field Y and Z mandatory but when the user clears the field X value still it shows them mandatory which i don't want
How can i handle this?
PLZ HELP!

Answer 1

Hi
What everyone described is using code block..
why not you should define it while designing the screen.
on defining the field Input/Output Field Attributes of Y & Z , define program-> input -> Required.
In detail :
INPUT/OUTPUT Field of Y & Z
Attributes
Dict | Program | Display
*Under Attributes -> Program -> Input (drop down list) -select as Required.*Hope it will work fine.
Rewards Points if useful