Hi Venkat,
I suggest to implement a Virtual Characteristic using Enhancement Spot RSROA and BAdI RSROA_OLAP_BADI. Please refer to SAP Note 1488910 - Kernel-based BAdI to improve runtime for more information.
Unfortunately, you have to add a new Characteristic to the Infoprovider if you need a new column. If you can use the same column, then you can use the same Characteristic (i.e. the value will be overwritten).
There is little documentation on the new Enhancement Spot RSROA and BAdI RSROA_OLAP_BADI. I suggest to have a look at the example Class CL_EXM_RSROA_OALP_BADI. Furthermore, you can have a look at the following SAP Notes for more information (even if it is written for enhancement RSR00002):
- SAP Note 891029 - RSR00002: Virtual chars and key figures in reporting;
- SAP Note 1717880 - Virtual Key Figures & Characteristics.
The documentation found here is basically still applicable. You only have to be aware to use in the context of the new BAdI.
Best regards,
Sander