Hi Heather, yeah, I get what you are saying about the linking records using the field 001 wich stands for OCLC control number. We just use koha record number. I noticed that you are not using $i subfield for the relationship designator-RDA Appendix J. Which subfield are you using ? Alsso I dont see this designator in your examples. By the way. do you know what is supposed to be exactly subfield $4 relationship. We just checked that in Spain they are using it as a code for the relationship, but there are no codes in RDA....it is confused Mercedes Portugal De: "Heather H Hernandez" <Heather_Hernandez@nps.gov> Para: "Mercedes Portugal" <mportugal@ign.gob.ar> CC: "koha" <koha@lists.katipo.co.nz> Enviados: Martes, 14 de Junio 2022 13:25:28 Asunto: Re: [Koha] Koha pluging for linking fields and RDA -76X-78X fields Hi, Mercedes! We are also a specialized library! I'm sorry that I don't have an answer for you about the plugin, but we have used RDA from almost the beginning of its introduction, and I've cataloged for decades using the 76X-78X fields (they predate RDA)--do you have specific questions about them? I have a public list of RDA records on our OPAC that might be of interest: [ https://keys.bywatersolutions.com/cgi-bin/koha/opac-shelves.pl?op=view&shelfnumber=52&sortfield=title | Contents of RDA records › SF Maritime NHP Research Center catalog (bywatersolutions.com) ] And there are also some sample records on the Koha Wiki: [ https://wiki.koha-community.org/wiki/Training_resources#Cataloging | Training resources - Koha Wiki (koha-community.org) ] We just discussed using the MARC21 78X linking entry fields at the last Koha-US Cataloging Special Interest Group (on June 2, 2022) which might be of interest, and the recording is posted on the Koha-US YouTube channel: [ https://www.youtube.com/c/kohaUS/videos | koha-US - YouTube ] (The Koha-US Cataloging SIG meetings are open to all, by the way, if you'd like to come to ask questions, get feedback, suggestions, etc.--you don't have to be a Koha-US member, or even in the US! Info here [ https://koha-us.org/special-interest-groups/ | Special Interest Groups – koha-US ] ) We're still on 21.05 (supported by ByWater Solutions) but will be upgrading to 21.11 in the coming months--I'm so excited about the new features! Cheerio! --h2 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Ms. Heather Hernandez (she, her, hers) Technical Services Librarian Library catalog: [ https://keys.bywatersolutions.com/ | https://keys.bywatersolutions.com/ ] San Francisco Maritime National Historical Park Research Center 2 Marina Blvd., Bldg. E, 3rd floor, San Francisco, CA 94123-1284 415-561-7032 (office generally M-W, telecommuting Th-F) [ https://webmail.lmi.net/src/compose.php?send_to=heather_hernandez%40nps.gov | heather_hernandez@nps.gov ] -- Mg. Mercedes Portugal Biblioteca Cnl. Manuel José Olascoaga Instituto Geográfico Nacional http://www.ign.gob.ar Av. Cabildo 381 – C.A.B.A. – CP: 1426 Tel: 011 4576 5576 interno 172