desabling the field in selection scereen

Question: Sorry for asking this question repetedly,
but iam not satisfied with the earlier answers.

my querry is
if there are 2 fields i.e A and B.
if u enter some thing in A field and press tab then the field B should be
desabled and A should remain enable.
i tryed following code but it works for enter. means if i enter something in A and press enter then A and B bother are desabling. but i want only B should be desabled and that too when i press tab key

code is :
report sy-repid.

parameters: p_one(10) type c,
p_two(10) type c modif id aaa.

at selection-screen output.
loop at screen.
if not p_one is initial.

screen-input = '0'.
modify screen.

endif.
endloop.


please give anwer qyick as i have to implement it right now in report.

Answer:
please give anwer qyick as i have to implement it right now in report.

Gosh .. I guess you're on your own. We're not helping you to develope a report here, we're trying to help you solve your problem.
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