Comment 8 for bug 1975879

Here's a branch that uses the logic from Galen's previous comment:

https://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/berick/lp1975879-volcopy-edit-callnum-owner

In the holdings editor, you will now see an edit (pencil) icon to the right of the owning lib, one per call number.