Applying earlier payment to invoice

amphysvena

Hi,
In vendor -> balance, functions -> apply entries. I set a payment as applying entry, after that I set applies to-ID to other invoice. The payment's date is earlier than invoice's date. I'll get this error message:
You are not allowed to apply and post an entry to an entry with an earlier posting date.

But if I set applies to-ID to the invoice first, after that I set the payment as applying entry, the payment successfully posted.

This has become issue in my client. Because now they set the invoice as applying entry. Then set the payment & other invoices paid by the payment as applied to-ID.
I've told the client to set the applied to-ID first, after that set the applying entry.
I'm using NAV 4, SP2.
Anybody aware of this bug?

Thanks