Source: Billable Transaction. Nullability enabled.
 Billable Transaction -> Circulation Billing link (None nullable) -> Checkout / Renewal Library (None nullable) -> Short (Policy) Name as "Checkout Library"
 
 Billable Transaction -> Circulation Billing link (None nullable) -> Circulating Item (None nullable) -> Call Number/Volume (None nullable) -> Bib Record (None nullable) -> Simple Record Extracts (None nullable) -> TCN Value
 
 Billable Transaction -> Circulation Billing link (None nullable) -> Circulating Item (None nullable) -> Barcode as "Item Barcode"
 
 Billable Transaction -> Circulation Billing link (None nullable) -> Circulating Item (None nullable) -> Call Number/Volume (None nullable) -> Bib Record (None nullable) -> Simple Record Extracts (None nullable) -> Title proper (normalized) as "Title"
 
 Billable Transaction -> Payment Summary (None nullable) -> Transaction ID
 
 Billable Transaction -> Payment Summary (None nullable) -> Transaction Start Time (Date)
 
 Billable Transaction -> User (None nullable) -> Current Library Card (None nullable) -> Barcode as "Patron Barcode"
 
 Billable Transaction -> Payment Summary (None nullable) -> Balance Owed