I'm using FTS to load MARC21 records supplied from BNB. All the records exist in basic form in the system having been created at the acquistions stage. The problem I'm having is that the ISBN field will not overlay when it has extraneous information such as (pbk.) and/or price information. Out of a file of 91 records only 22 have been overlaid which is a large amount of tinkering. I have seen that there is a known issue with ISBN validation failing with additional numerical information in this field but is there some way of forcing the overlay that I haven't found? I have found the manual of little help on this subject. I'm using m2btab.b and the ISBN is set to BIBLIOGRAPHIC ISBN/ISSN(i) 020-024 ALL Thanks for your help. Catherine ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Catherine O'Sullivan IRC Systems Co-ordinator St Mary's College Strawberry Hill Waldegrave Road TWICKENHAM TW1 4SX Tel: 020 8240 4303 Fax: 020 8240 4270 email: [log in to unmask] Website: http://www.smuc.ac.uk A College of the University of Surrey