No rep output caused by incompatible frequency

Question

Hi All,
I wanna to run another rep from a rep using srw.run_report. Here is my code :
function BetweenPage return boolean is
begin
     IF pkg_var.v_loc_from = 'KL' THEN
          IF pkg_var.v_loc_to = 'PTI' THEN
          srw.run_report('report=ticket_thailand');
          END IF;
     END IF;
return (TRUE);
end;
The value of the pkg_var is referred to formula column which again refer to column retrieved from SQL.
I got this error : column 'cf_loc_from' references column 'loc_from', which has incompatible frequency.
Pls help
Thanks,
Shu Wen

Answer 1

Shu Wen,
The code that is causing the frequency error is the code that is accessing the formula column.
A reference to a data value from within a between pages trigger doesn't make
sense unless the data doesn't change any during the course of executing the report (in this case,
the destination is always the same for the entire report).
If this destination location data doesn't change across the execution of the report, it needs to be at the "report level",
e.g., in a user parameter, or a report level formula (a formula outside of any query). To set this value, you need
to run the query to get this value in pl/sql that executes only once; e.g., in the after parameter form trigger, or
or in the trigger for the report level formula column.
If the destination changes (the query returns multiple rows) and depending upon which destination you are currently
processing, you want to execute a second report, then you need to move this logic from the between pages trigger to
a format trigger for a field that is displaying the data, or alternatively to the formula column itself.
Hope this helps....
regards,
Stewart