Call proceedure results a null value

Hello everyone,

I have written a simple calculation procedure.

CREATE PROCEDURE _SYS_BIC.calculation(IN value1 decimal(15,4), IN value2 DECIMAL(15,4), OUT result_value decimal(20,4))

  LANGUAGE SQLSCRIPT

  SQL SECURITY INVOKER

  READS SQL DATA AS

BEGIN

declare a decimal(15,4);

declare b decimal(15,4);

declare result_value decimal(20,4);

a := :value1;

b := :value2;

result_value := (:b)/(:a/100);

END;

And I run the procedure with the following statement:

call "_SYS_BIC"."claims.dev_test/calculation" (value1 => 10,  value2 => 2, result_value => (?))

I get the result as "?".

For me everything seems to be fine. Can anyone suggest me the cause for the error.

Thanks