Correcting Inventory (with counting journals) after Stock closing

if we want to correct the inventory before a specific date (December, 31th 2014). although we are in January 2015.

We just creates counting journals at 31/12/2014 and validate them?

Is there any problem if we make this operation after closing inventory and after the financial openness of the year 2015?

Generate the journal, check the on hand expected in the journal is that of the date and not today, enter the count that you have already done and then post the differences. Not really a process to back date in this way, but it will let you do it if the periods are open.