Hi CIMC,
The inability to allocate payments to invoices older than 12 months directly in the Bank Transactions screen can be resolved by manually applying the payment in Sales. Go to Sales > Invoices. Locate the unpaid invoice(s) that are older than 12 months. Click into the invoice and use the record payment option. Enter the payment details manually, ensuring the amounts match.
Once the payment is applied to the invoice, return to Bank Transactions. Locate the payment in the bank feed. Mark it as reconciled by selecting it and confirming the match with the manually recorded transaction.
Regards,
Sai