From Accounts Payable, select PO forms, Define Custom Form:

1. Type in C to change.
2. Type in the Form name and press Enter.
3. Type 2 to changed field 2, and press Enter.
4. Press Enter until cursor is at Next Form From.
5. Press the F1 key to view your options.
6. Highlight option U - Form number comes from user, press Enter
7. Press the F2 key, press Enter to accept the change, press ESC, type in E to end.