Query regarding row level calculations in Bex

Question

I have a scenario where I am creating a report on a multiprovider. This multiprovider is based on General Ledger and Profit Center Accounting cube. The PCA cube has accumulated balances at G/L account and profit center level, and GL cube has balances only at General Ledger account level.So when a report is created on this the data displayed looks like:
Account Profit Center Balance
1000             1234            100000  - From PCA cube
1000              2345            200000  - From PCA cube
1000              Not assigned 400000 - From GL cube
There are some cases where the total balance at G/L account level does not match both the cubes ( as in the above example, as per PCA, balance for G/L account 1000 is 300000 whereas as per GL cube, balance at G/L account 1000 level is 400000.)
Hence we require a separate row showing this difference ( not column)
Therefore actual output required for the above scenario is:
Account Profit Center Balance
1000             1234            100000 
1000              2345            200000 
1000              DIFFERENCE           100000 - (400000 - sum of above 2 balances)
Total                                 400000
It would be very helpful if anyone can give inputs on how this can be achieved.

Answer 1

Have you considered Virtual Key figure. This will allow you to do such complex calculations.
Thanks
Sharan