Before , after images not populating in cube

Question

Hi All,
we have a data flow wherein the data from the dso is extracted delta wise to cube . Now for a particulat document , the doc did come to ods and then to cube . then in r/3 there a change to the document , this was then again extracted to ods and then to cube . now the problem is
the cube is showing both the values of before change and after change in the cube . I checked in the ODS only one record of changed value is there. in the change log after, before and new images for the doc no is there but in the cube the data is doubling up intead of showing th latest.
Any idea why this is happening.
Does compression play any part.
some more info to understand better:-
in cube already KF1 = 100 , ch1 = 'a' ch2 = 'b'.
sam in ods KF1 = 100 , ch1 = 'a' ch2 = 'b'.
now in r/3 change ch1 from 'a' to 'n'.
so in ods KF1 = 100 , ch1 = 'n' ch2 = 'b'.
in change log table
KF1 = 100 , ch1 = 'a' ch2 = 'b'   record mode = n
KF1 = -100 , ch1 = 'a' ch2 = 'b'. record mode = b
KF1 = 100 , ch1 = 'n' ch2 = 'b'. record mode = (after image)
now in cube
KF1 = 100 , ch1 = 'a' ch2 = 'b' 
KF1 = 100 , ch1 = 'n' ch2 = 'b' 
SO the key figures are adding up , which should not be the case.
Regards,
Sushmita
Edited by: sushmita das on Apr 14, 2011 7:36 AM
Edited by: sushmita das on Apr 14, 2011 11:11 AM

Answer 1

Hi Sushmita,
In ODS only if the key fields are same, then any change in Data Fields will be overwritten. And the new record will be updated to the cube.In cube data is not overwritten instead it is added or updated.
For eg:
DSO
Key field   Data Field
A                 100
B
C
So initially in cube also these values will be there.
Now suppose keeping all the Key Fields same, the data field is changed to 200 in R/3. So in DSO an after image will come and u will see that in the change log table there are 3 records, one will 100, another will be -100 and another will be 200.
But when u take that data into cube the data field value will be added up to 300.
However if Key field value 'A' is changed to 'D' in R/3 then in cube there will be 2 records
One having Key fields as A B C and Data Field as 100
Another having Key Field as D B C and Data Field as 100.
If you want to delete the first request from cube and only update the new record then you will have to delete contents of the cube and freshly load it.
Hope it helped.