Cycle Billing question

Hi Distribution Community,

I have a question about Cycle billing.

We have some sales orders with the scheduled invoice date(Table F49211) in the previous financial year(December 2015). Somehow the sales orders did not go through the print invoice program and the sales update.

Now how do we execute the invoice program for these sales orders, is there any option other than opening the Period 12 of 2015(this is what i deem as one solution) ?