"Adjustment [#] contains a posting date for a financial period that has not been setup"

Hello - We are currently running GP2013 v12.00.1745. When attempting to reconcile a bank statement we are getting the following error:

"Adjustment [Adjustment #] contains a posting date for a financial period that has not been setup."

NOTE: The transaction date is 2/29/2016 which is a leap year so not sure if that would be related at all?

I've checked the 'Fiscal Periods Setup' and everything is open. We have a straight forward setup with 12 periods (1 per month).

Any help/tips is greatly appreciated!