Enter manager mode, enter transfer mode, then scouting mode, THEN ACTIVATE THE OPTION, then exit back once to the transfer screen (at this point it updates), then disable the option.
By activating it before entering the scouting mode it simply won't work. I believe the wording is correct in the trainer help file and reflects the above steps, but if it's not let us know.
Unfortunately this still didnt work. followed the above, activated the option in scouting. exited to transfer screen. nothing. no extra cash.
I also got this from the help file.
In 'MANAGER MODE', make sure you are at the main screen (with the display of 'NEXT MATCH' etc), then choose 'TRANSFERS'. Activate this option. Now choose 'SCOUTING'. Once this screen has loaded, press ESC to return back to the main menu. Disable the option. You should now have more cash. Repeat if necessary, although be warned, the cash will increase in exponential amounts each time.