ABAP selection screen modification

Hello,

I have the following selection screen:

PARAMETERS: 
p_kalaid LIKE kala-kalaid, 
p_kalabe LIKE kala-kalabez,
p_kalada LIKE kala-kaladat,
p_klvaf  LIKE kalv-klvar, 
p_tvers  LIKE kala-tvers, 
p_kokrs  LIKE kala-kokrs, 
p_bukrs  LIKE kala-bukrs,               
p_group  LIKE kala-rfc_group.   

When I choose F4 on <b>p_kalaid</b> and then select one value proposed, it fills <b>p_kalaid</b> (as expected), but it fills <b>p_kalada</b> automatically as well!

My goal is to have all parameters fill in automatically with data from tables <b>KALA</b> and <b>KALV</b> based on my key selection (<b>p_kalaid</b>)... how can i do this?

Thanks,

Tim