How the system know the actual period in the Production startup of ML?

Question

Hi experts:
I have a question:
We want to make a prototipe of Material Ledger/Actual Costing.
At first we want to make a copy of all the information of one Client for example until 31.11.2009 to another Client.
I have readed that when you make the Production Startup process of ML, the system transfers inventory quantities, inventory values and prices from material master records to the material ledger data for the current period, the previous period, and the last period of the previous year.
The question is How the system can determinate the actual period??.. Is this based on the MM logistic periods??.
  At last if we do the copy of all the existing movements to our client until 31.11.2009 but the MM logistic period was 03/2010, What is the Actual Period for Material Ledger at the moment that I realize the Production startup?.
Thanks and regards!!
Manuel

Answer 1

Hi Udo:
At first, thanks a lot for your fast answer:
In the SAP HELP library in "preparing data for Material Ledger (production startup), you can find the next:
When you have finished the production startup, the system does the following:
Transaction Data
1. Transfers inventory quantities, inventory values and prices from material master records to the material ledger data for the current period, the previous period, and the last period of the previous year
2.- Calculates the inventory values and prices in the currencies of the material ledger at the current date using the stated exchange rate type
3.- Amends the purchase order histories with the set currencies, using the settings for additional currencies found in Customizing for Financial Accounting
Like you said in your last replay, this process ONLY transfer  (Quantities and values related to the inventory??
What happend with the goods movements which have already exists in SAP before  you  set  Valuation areas as Productive in ML??..
Thanks!
manuel