When returning item info we only include the main 'title' field - for check-in machines this can be unclear when a patron is returning multiple volumes of a series or other items that may share parts of a title. It would be nice to have the option to return full title info
I agree that from the patron's perspective it would be much clearer if the AJ field (title identifier) could contain more information on both check-in and checkout machines. I think that subtitle would be a good addition, but when it comes to magazines and other serial publications, items.enumchron is also a crucial field when it comes to easily differentiating one item from another. But does the SIP2 standard have restrictions on what should be transferred in each field? The AJ field is currently described as "variable-length field. Identifies a title; could be a bibliographic number or a title string". What can be a part of a "title string"?
I think since it's not stating anything more specific we could interpret title string a bit more broadly. I agree that number and part are also crucial for some type of media and would love if it could be extended to include that information by default even.