Warning message for deleting items with active/pending digitisation request

Recently an academic deleted a number of reading list items with digitisations attached, but there was no warning for them (beyond the standard item deletion message), and no indication to us that this had happened until we were checking the link from TADC to the reading list and received an error message. It would be good to prevent these list items from being deleted by non admin level users, or for them to at least to receive an additional warning message. If these items are deleted by anyone, it would be good if it generated a notification as TADC is not automatically updated and a manual action needs to be taken.