New Date field for Vendor Invoices

The business would like the ability to enter an additional date (date invoice is received by AP) for vendor invoices. There doesn't seem to be any additional date fields available in the BSEG/BKPF tables. We want the field available in the TCodes where vendor invoices are entered or parked (FB60, FB65, FV60, FV65, MIRO) We are on ECC 6.0. Can anyone help answer the following questions:

• Are there fields available for this that I am not aware of
• Have others added new custom fields to any of the above TCodes?
• If it is possible, is the field created in a custom table? Would we need to create new custom TCodes for the 5 programs used to enter invoices?

Any details or suggestions would be greatly appreciated.

Thank you

Cindy C