How to best account for 1099 transactions for prior year entered in current year?

Summary:

We have a number of partners for Accounts Payable that will send us transactions that need to be accounted for in 1099 processing. In our previous ERP we could perform an upload with a payment date assigned (allowing us to add a transaction for prior year in the current year). We need to be able to do this in Oracle as well.

Content (required):

We have built an integration that will allow us to dynamically create suppliers and invoices to account for these Non-ERP transactions (payments made through non-Oracle Payables but still need to be accounted for in Oracle 1099 reporting for a supplier). We need to be able to change the Payment Date though in order for all the 1099 reportable transactions get picked up.