FI - Period "X" not allowed

Hi,

I'm a MM consultant and I need some help about a financial problem that is blocking me from doing anything in logistics.

When I try to enter a good receipt or a good issue, the system tells me that "Period 12 is not allowed".

When I go to the OB52 transaction, I can see two different ranges for period 1 and period 2, the first one is from 1-2008 until 12-2008 and the second one is from 13-2007 till 13-2008.

I really don't understand... If someone has an idea... At least to allow me enter goods movements.

Thank you very much.