BPC NW 10 SP12 dimension Time - use base_period property by WEEK

Hi,

For the retail customer, we will manage the new TIME dimension by WEEK

I created a new dimension TIME with LEVEL, PERIOD, YEAR and BASE_PERIOD.

I created a standard model (no financial or consolidation model)

Question 1 : Is it mandatory to manage the BASE_PERIOD ? According to SAP Help, the BASE_PERIOD is used for the query but there is not more explication

Question 2 : what is the codification to manage the week.

In standard, for the January month , the value is  1

In standard, for the February month , the value is   2

In standard, for the March month , the value is     3

In standard, for the 1 Quater  , the value is  3

Proposition

Week 1 :  10

Week 2 :  20

Week 3 :  30

Week 4 :  40

January : 100

Week 5 : 110

Kind regards

Bastien