The site I'm building is essentially a book-selling site, where customers use custom line items to submit citation information for a generic "Book" product type (I can't set up individual product variations because there are thousands of books, and they aren't all actually inventoried - long story).

As such, the staff for this store will need to get access to the submitted citation information, and augment it with more complete/accurate details. However, I have yet to find a form that exposes this information for editing? I can build a view off the line item ID that exposes what was submitted, but I'm having a hard time making that information editable? Line items don't appear to be nodes (I'm assuming that they're entities?) - is there a best-practice way to make this information editable?