Sage 100

Hello, Nobody use below t ransaction (#A000815 N ). But Sage100 said 'Record(A000815 N) is in use by another user' as shown below. I would be grateful if someone let me know. Thanks!

How do people handle invoices that come in after the period has closed? Do you change the invoice date to the current period so the GL will tie to the aging? Or do you keep the invoice date as is, let it age out to the appropriate column, knowing that…

It appears that the AP check register posted twice in the same day. I didn't know that was possible. How do I unwind the double posting?