Urgent help on SAP BW3.5 GST Query Changes

Question

Dear Experts,
Need your urgent help in modifying a query.
Requirement: The Query has two different hierarchy node structures in 1 hierarchy itself.
This hierarchy is used in report where we can now see 2 different node structures added, for which the calculation of Rate is different for one node and different for another.
Rate = Tax/ GST Val * 100 for first node
Rate = (GST Val /(GST Gross - GST Val)) * 100 for another node.
The differentiating factor for these two nodes is Tax Code which is a char value.
This rate value couldnt been calculated at Report level for the reason being that all others the Key figures except Tax Code which is a char and hence couldnt put any formula there.
We tried calculating the Rate at Cube lebel itself by creating another Key figure and written a 'field level routine' to it, it is working good and showing the right values at cube level, where the data is stored at Line item level.
Now the challenge is that in report, as we execute them at aggregated levels the value for Rate is being cumulated (added) and shown which is wrong.
Eg:                 Account  LineItemNo  Input Tax Credit                            GST   GST Rate
     123     1     10              10     100
     123     2     20              20     100
In Report when we look at these figures it appears at say Account level then it is appearing as :
Account   Input Tax Credit  GST   GST Rate
123     30        30      200 (Instead of 100 as expected).
Can anyone help us to resolve this, this is of top most priority to us.
We are not using any WAD and system is BW 3.5.
Please suggest if WAD can help us in this.
Kind Regards,
RJ

Answer 1

Hi Gerrit Schang,
Thanks for your instant reponse, appreciate it.
But as this is BW3.5 system, the option for Exception Aggregation selection as  "no aggregation along the hierarchy" is not available in dropdown.
But there is one option as 'No aggregation (X, if more than one record occurs)' below which there is an option to chose the Agg.ref.char on which this aggregation should be checked.
Can I use this option and select ' Account Number' as the Agg.ref.char to solve my problem?
or you have any other solution, please suggest.
Kind Regards,
RJ