On 10/3/16 I voided an open invoice from 2015.  When asked what accounting date to use, I chose the current day of 10/3/16.  I then re-entered the invoice with an accounting date of 10/3/16.  I'm now trying to close the month of September and the AP summary, with a cutoff date of 9/30/16, is out of balance the amount of the invoice.  I need to know why this affects the month of September and how to fix it.  Thanks!