To Maintain Last Year's invoices, the amount for the Open Item:
Go to Transactions, Open Item Menu Debtor, Maintain B/F Bills, click on the Add button to maintain last year's individual invoice amount.
For debtors traded in foreign currency, click on the checkbox of Foreign Currency Bills, then the Add button to key in the invoice amount with the Currency Rate.
The same steps apply for Open Item Menu Creditors. For the creditor, you can add a lump sum amount owing to that creditor based on the opening balance amount, or you can maintain the individual invoice amount as per last year's data.