We want to be able to add a requests Internal Identifier number to the Resource Sharing Shipping Slip letter & the Resource Sharing Receive Slip letters, as a way to clearly and consistently identify a request. Because the external ID can change over the life of a request, we will often refer to the internal ID instead. It's useful to have this on the shipping and receive slips because 1. If the partner or patron needs to communicate with us they can quote the ID number, and 2. this paperwork often remains with the item when it comes back to us, so we can then scan in the ID for the request.