Draft Document Unique Number

Hi All,

I am creating a Print layout design for AR Invoice - Draft. Instead of printing the draft document number which usually have the same number, I would like to use the unique draft internal number ODRF.docentry.

But from the PLD table and column I could not find this ODRF.docentry.

What will be the correct table and column to get this unique draft internal number from Print Layout Designer?

Please help me, so I do not have to manage a manual invoice number.

Thank you,

Annie