Import AP Credit Memo through the interface and set "Credited Invoice"

I am using the AP Invoice interface tables to import the invoices.  Need to import the CREDIT Memo sent by the vendor and want to set the column "Credit Invoice" (at the header level).   When we manually enter the CM from the front end the screen  gives the option to enter the field "Credit Invoice" but when bringing the invoice through the interface table we can not find the field that can be populated so that Original Invoice and the Credit Memo can be linked.

Please advise.