form4.5 question

I created a form with master detail block and attached a trigger to field called total_amount to calculate total.
For that I wrote procedure as below:
begin

     :total_amount := :period * :rate;
end

becasue rate is the field of table outside master-detail block and form so in runform it didn't calculate total.

any help would be appretiated. Received on Fri May 03 1996 - 00:00:00 CEST