Very urjent how to validate filed in dialogprograming

hi experts this is very urjent reqirement.
i am doing dialog prg i have four fields in my screen like kunnr name1 etc.. this fields coming from (kna1) internal table is it_mat.
i have another table like knvv.
validation is.
when i click on save the reord shoud be update based on knvv-kunnr1.
for ex in knvv-kunnr1 having record 1234. if i go for my dialog prg kna1-kunnr inserting the same record 1234 wiill be accept and update table kna1 other vice eroor will be display like record does not exist in knvv-kunnr.
can u please provide logic
thanks in addvance
points will be awarded

Hi Maha,
In the PAI of the concerned screen, create a module. In the module, check the kunnr from the screen field against the knw table using SELECT. If a record is found in the table, go ahead and save the entry in KNA1 else show the error message.
Hope this helps.
Sanjeev

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