The library branch settings /cgi-bin/koha/admin/branches.pl have a "Pickup location" setting which allows libraries to specify which branches serve as pickup locations for holds. It would be useful to specify whether a branch can be selected in the interlibrary loan location dropdown as well, for analogous reasons (e.g., storage branches which do not fulfill holds nor ILL requests). For our purposes, we could use the same setting to populate the ILL requests branch menu, but it is likely that other libraries may want a branch to serve only holds or holds ILLs for one of any number of reasons.
This sounds a lot like the functionality described in bug 40075 - ILL Standard form should only show libraries that are pickup_locations. Is this bug looking to create a different functionality? *** This bug has been marked as a duplicate of bug 40075 ***
Like I said, for us pickup locations and ILL ones are the same, but I can imagine other library systems where certain branches are pickup locations but do not fulfill ILLs. But the other bug is fine for now and maybe it makes sense to wait until someone has an actual use case for this one.
Sorry, I see the difference now. This would be a useful feature to have.