Use Period Number 13 & 14

As of now, we are using 12 periods. So F0010 holds the same date for PN 12, 13 & 14 ( 31/12).

Now what is the best way to start using periods 13 ( and 14) ?

The below is my analysis:

As PN 12 is already having posted transactions on 31/12, I guess we cannot use PN 13 and PN 14 from the previous year. But we can change PN 12 to 29/12, PN 13 to 30/12, and PN 14 to 31/12 from next year onwards.