Oracle Reports A READ-ONLY bind variable used in OUT or IN-OUT context

问题

I have a formula column in my report as you can see in the image. When I compile it, I have an error: "A READ-ONLY bind variable used in OUT or IN-OUT context"

My query gets 1 line result. Properties like in the image. Why I got this error and what is the solution?

回答1:

Function code is wrong (obviously; Oracle told you so). Should be something like this:

function CF_1Formula return char is
begin
  return case when :kart_geldimi = 'E' then 'sss'
              else null
         end;
end;

Basically, you created something like a circular reference and tried to use formula column as the OUT value (that's what :cf_1 := 'sss'; did).

来源：https://stackoverflow.com/questions/60340337/oracle-reports-a-read-only-bind-variable-used-in-out-or-in-out-context