Thanks for the link, Fabio. I tried making a barcode matching rule, but it doesn't seem to work, because when I tried staging Marc records for import, I got this: 5068 records in file 0 records not staged because of MARC error 5068 records staged 0 records with at least one match in catalog per matching rule "barcode" 5067 item records found and staged This tells me that nothing matched the barcode check. This is my record matching rule for barcodes: Matching rule code: barcode Description: Checks for the same barcode Match threshold: 100 Record type: Bibliographic record Match points: Search index: barcode Score: 101 Match points components: Tag: 952 Subfields: p Offset: 0 Length: 0 Normalization rule: Does that look right? -- Tim -- View this message in context: http://koha.1045719.n5.nabble.com/re-importing-books-duplicate-barcodes-tp57... Sent from the Koha-general mailing list archive at Nabble.com.