AddReserve() in C4/Reserves.pm inserts hard-coded string "Reserve Charge - " into accountlines db table.
And sco-main searches for that exact string: opac/sco/sco-main.pl: description => 'Reserve Charge - ' . $item->biblio->title,
Adding Martin as we just discussed this issue today (might be a duplicate to some of the accounts work)
*** This bug has been marked as a duplicate of bug 12166 ***