Need the solution in the Bex Query level for a Business Requirement.

Question

Hi BI Experts,
I have a requirement at Bex Query level and the scenario is like this:
Business Logic.
Right now am showing the Stocks falling in to time slot like 6-9 months and 10-12 months from the date of PKD in two columns B1 and B2 respectively.
And also calculating the stock selling price of B1 with 30 % discount and B2 with 50% discount.
In the above said discounts client may change the discount % in any future Quarters
Now the requirement is, if client needs to see the history of sales according to the declared Discount selling prices of stocks falling into B1 and B2 slots, he must get the values accordingly.
( Am using the Formulas for calculating the Discount % for the Stocks fall in to B1 and B2 slots)
Business Example:
For Q4 2007 The discount for B1 Stocks is 35% and B2 Stocks is 60%.
For Q2 2008 The discount for B1 Stocks is 35% and B2 Stocks is 55%.
For Q3 2008 The discount for B1 Stocks is 30% and B2 Stocks is 50%.
For Q4 2008 The discount for B1 Stocks is 40% and B2 Stocks is 50%.
Now running report ( running in Q4 2008  at some date) if client needs to check the B1 and B2 stocks in Q4 2007 or Q3 2008 the values need to come with the calculation of repective % of disounts declared in that quarters along with the selling prices in that quarter.
This all should be done at query level nothing to do at Infoproviders level.
Is there any option like storing query data as a master data  and retrive it according to the selection to get the exact values of the respective % Discounts and time lines.
If It is not clear come up with questions for still more clarifications.
Points are assured.
Thanks in Advance,
RK.

Answer 1

Who is defining the % discounts for periods/quaters?
Is this maintained in a custom table or externally in legacy/R3 system?
There are various ways to achieve the result. Variable exits can be used or virtual KF/char can be used but all depends on actual requirements.
Cheers