In PO's Company Profile, Ledger Interface Tab we have these options:

Send to G/L as transaction comment: Purchase Order description
Send to G/L reference field: Original document number
Send to G/L description field 1: Vendor Name
Send to G/L description field 2: Receipt number

When I look at an account in G/L (i.e. 2015 A/P Clearing), I see in the grid, the Reference showing the PO# and the Description showing the Vendor Name. So, it's the Reference field that I would like to change to the ADJ#.

In PO's Company Profile on the Ledger Interface tab, the option "Send to G/L reference field" does not offer "Document code" as an option. How do I set it to %dno?