paremeters in selection screen
i have 3 parameters p1 p2 p3
p1 is OBLIGATORY and p2 p3 is not
where f1 = p1 and
f2 = p2 and
f3 = p3.
the sy-bubrc = 4.
but in table link ,there are values .
how to write this. i don't want to write this select laguage several times