Next Number set up

Hi All,

We have the following requirement regarding next numbers: We need to for invoice and credit note that next number for 2015 continue from the last one used on 2014.

For example:

31/12/14 à 14000067

01/01/15 à 14000068

Up to now, we were just able to get the following:

01/01/15 à 15000001

01/01/15 à 15000068

But unformtunately, this is not enough.  Do you have any idea if this is possible?

Thanks

Joaquin