Hi In MillCat I have no problem overlaying changed authorities that have been sent to us by Backstage during the Notification service - but although we have AACP turned on, it doesn't change headings in bibliographic records. I even suppress and unsuppress the authorities after overlaying to try to force a change in the bibliographic headings, but nothing happens. Can anyone tell me why this is? This holds true of our a, d, e, and j (MesH) indexes. Regards Paul Davey Cataloguing Services Manager Wellcome Library 183 Euston Road London NW1 2BE T +44 (0)20 7611 8493 E p.davey@wellcome.ac.uk The Wellcome Trust is a charity registered in England, no. 210183. Its sole trustee is The Wellcome Trust Limited, a company registered in England, no. 2711000, whose registered office is at 215 Euston Road, London NW1 2BE, UK. This message has been scanned for viruses by BlackSpider MailControl - www.blackspider.com