I have discovered a sort order issue when sorting on catalog numbers.
I think this is due to your recompilation for my other issue with partly hidden dates in reports using italics and right justified fields. From this topic: http://www.fnprg.com/forum/viewtopic.php?f=28&t=12675&sid=f359f56d1745f626da67669cbb0bd714#p58730
As for now, cat.no sorts in this order: prefix, cat.no and then suffix.
It should be cat.no, prefix and then suffix, I think.
Could you please have a look into this?