A book is a new edition of the title in the catalogue, but their records are, and should remain, completely unrelated. I couldn't see a record for it in the acquisition module so I searched for it by ISBN from here: http://localhost:8080/cgi-bin/koha/acqui/parcel.pl?type=intra&supplierid=4&datereceived=2010-10-14&invoice=2117008 under "search orders to add to this shipment" to check that the new edition record wasn't tucked away somewhere. I got the error message "Can't use string ("0") as a HASH ref while "strict refs" in use at /usr/local/share/koha/cgi-bin/acqui/orderreceive.pl line 192." This appears to be because the end of acqui/orderreceive.pl doesn't check whether the earlier GetBookSellerFromId actually found anything. I will prepare a simple patch. I think this is 3.0.x only.
The following changes since commit dc7e0ecba7cd256ffab014ff6f6f658eaf561fb4: MJ Ray (1): [Bug 5394] Handle situation where bookseller is not found are available in the git repository at: git at gitorious.org:koha/mainline.git for-3.0/bug_5394 Taken from http://lists.koha-community.org/pipermail/koha-patches/2010-November/012939.html
3.0.x is no longer maintained, so I will mark this as WONTFIX.