Concept of Non-cumulative KYF

Question

Hi experts,
   We are using some non-cumulative KYFs in our FI customizing cubes. It really brings troubles for the project. Like:
   - Poor query performance
   - No special 0FISCPER value due to setting as 0CALDAY for the base time reference characteristic
   - No useful aggregates could be created as 0CALDAY can't be removed from any aggregate
    As so many troubles show up, I can't help wondering: where is the advantage?
    In our cube, Z1BALANCE is a non-cumulative KYF with inflow (0DEBIT) and outflow (0CREDIT). What is the difference if I set a general KYF Z2BALANCE to replace it and write code in update rules: result = 0DEBIT - 0CREDIT ?
    Would you please explain this in general words and examples instead of bunch of links?
Regards,
Aaron Wang

Answer 1

Hi,
At all  this is link will help you understand non-cumulative better.
http://help.sap.com/saphelp_erp2005vp/helpdata/en/41/b987eb1443534ba78a793f4beed9d5/frameset.htm
Non cumulatives are calculated at the runtime of the that's why query performance is slow.
The option is to compress the cube at regular time interval in case od non- cumulative.This will help in query performance improvement.
I think you can give any time reference in the cube if you want other then 0calday that's you can do at the cube level.
Ya aggregates cannot be created.
you can use non- cumulative as well as cumulative key figure to the same.
depends upon the scenarion which you are working on.
If you data changes frequently then you should use cumulative key figures.
But if it changes non- frequently then should use non- cumulative.
The advantage is it gives you the values  with reference to the time there are cartian scenarion which can only be modeled through non - cumulative.
Like inventory where at any point of time you can have just change in the values of the stock.
i.e. always a delta brings in the change in the values of the invenctory.
Inventory va;ues can be maintained in the form of inflows and outflows.That is waht is increasing the stocks and what is decreasing.
Now if you just subtract( inflow- outflow) it will just give you the value at that aprticular time.
This one page documnet explains everything.
In our cube, Z1BALANCE is a non-cumulative KYF with inflow (0DEBIT) and outflow (0CREDIT). What is the difference if I set a general KYF Z2BALANCE to replace it and write code in update rules: result = 0DEBIT - 0CREDIT ?
you can do it through cumulatives also.But that you will have to maintain at the ODS level and then subtract the key figures in the update rules it and maitain it in the cube.
That will get stored with refernce to the time and will work well.
http://help.sap.com/saphelp_erp2005vp/helpdata/en/8f/da1640dc88e769e10000000a155106/content.htm
Hope it helps
Thanks