Price Determination (Pricing) Date Control - Purchase Order

Question

Hi,
We are exploring the Price Determination (Pricing) Date Control in the Purchase Order.
Clientu2019s requiring  is, correct me if it is a wrong requirement:
We have created Tax Codes:
C2 -  CST 2% valid from 01.04.2010
C3 -  CST 3% valid from 01.04.2010
We have created a purchase order with Tax Code C2 - CST 2% on 30.03.2010 as we are in doing back log entries. Since the tax code is valid from 01.04.2010 only , the purchase order is not displaying the Tax Code Value .
Now we are doing the Goods Receipt on 01.04.2010, the system will not pass the entry for the CST as at time of GR, the System picks up the Tax data from the Purchase Order.
Now we want that the System should pick up the Data at the Goods Receipt, not from the Purchase Order. Some one advised me to use put GR Date in Pr. Date Cat. Under Item-> Condition Control tab. We are able to view the Pr. Date Cat by changing the Screen Layout of ME21N.
We want to know what use of the same & under what condition is, we use this.
Our suggestion:
1. We are of the view that we should create the Tax Codes with Valid Date from 01.01.2010 (not from 01.04.2010 as currently maintained)
2. Or since we are doing the back log entry, we should create all the Open Purchase Orders dated 01.04.2010.
Is this the correct way which we are suggesting?
Please note that we are dealing with Excise Materials also?
Please guide.

Answer 1

Thanks for the reply,
While testing the same, I also encountered the somewhat same problem.
You are suggesting that we should change the Tax Code Valid From Date.
What do mean by the follwoing:
Pricing date category "GR date" can't be set in PO if price is entered manually (with condition type PBXX). This also means manually entered conditions at Po will not be used.
Regards,