I'm a cataloguer in a UK university library.
I'm tidying up some of our A/V records and haven't a great deal of experience with MARC. I'm trying to find a tag for 'this item is also catalogued as...'.
Background: a video made for one course was subsequently used in another and has a bib record for its existence in both courses; the two records are broadly the same apart from the 110 fields which contain the course codes as well as the university name. (However one has a 525 tag pointing to a transcript but the other doesn't, hence the usefulness of linking them.)
I thought 535 looked promising at first glance but realised it's not suitable as both items are in the same repository. Then I considered 776 but ruled it out as the physical format is not different. Anyone know what I should use?