Receivables is obtained from the transaction_date in the rcv_transactions

table. This is the date which shows on the Receiving -> Receipts form in

Purchasing when receiving against the PO. In order to reflect the actual

date the product was received, if different from the current date, this

field should be updated on the form.

NOTE: Prior to the fix in patch 1165312 the ship_date_actual for drop

ship lines was passed to Receivables as NULL, which caused the order_date

to be used on the invoice.