“Difference unbilled account not filled yet!” saat save RI

Jika pada saat Save&Close transaksi Recieved Items muncul :
Difference unbilled account not filled yet!,
please complete it at Preferences | Purchases | Receive Item.
Hal ini dikarenakan setting akun Difference Unbilled di Setup – Preferences – Purchase | Purchase Return | Differece Unbilled, belum diisi. Diisi terlebih dahulu baru kemudian Save transaksi RI tsb.