Selecting Data from DSO via ABAP Routine

Question

Hello,
i dont know how to solve my special requirements with sap bw. Maybe you have some idea.
I have a row of data in my DSO, which is like:
Date               ObjectA     ObjectB          Amount
2014 08 18     testA          testB              1000
2014 08 19     testA          testC              500
2014 08 20     testA          testB              2000
I want to have a key figure in my reports, which shows a special smoothed average per day of the past 3 months for each day-object combination.
The formula how the average is calculated, should be neglected in that example.
Date               ObjectA     ObjectB          Amount     smoothed average
2014 08 18     testA          testB              1000          900
2014 08 19     testA          testC              200            150  
2014 08 20     testA          testB              2000          950
2014 09 20     testA          testB              3000          1000
My first idea was that I have to create that key figure in the transformation from DSO to my cube, because there is no option for that advanced calculations in queries.
So I need access to all the data in my DSO while i am in an abap environment in the transformation routine. I need that because i have to do calculations from data in the past. How can I achieve this? Or are there other ways to solve my requirements?
I hope you can help.
Best regards
Simon

Answer 1

You should utilize the start routine or end routine functionality of a 7.x transformation.
You can read from the DSO active table which has the naming convention: /BI0/A + dsoName + 00 (business content dso) or /BIC/A + dsoName + 00.
For example in end routine:
//local data declaration
DATA: lt_dso TYPE standard table of /bic/azfi_o0100.
FIELD-SYMBOLS: <fs_dso> type /bic/azfi_o0100.
//get data
SELECT *
FROM /bic/azfi_o0100
INTO table lt_dso
FOR ALL ENTRIES IN RESULT_PACKAGE
WHERE objectA = objectA AND
               objectB = objectB.
SORT lt_dso BY objectA objectB.
//populate result package
LOOP AT RESULT_PACKAGE ASSIGNING <result_fields>.
READ TABLE lt_dso ASSIGNING <fs_dso>
WITH KEY objectA = <result_fields>-objectA
                  objectB = <result_fields>-objectB
binary search.
//do calculation...
<result_fields>-zsmoothavg = ...
ENDLOOP.