Rohit,
Thank you so much for this information. I was not aware about that.
I am not sure if you got a chance to check the earlier issue of mine: In Sandbox and Test environment, the BSI Upgarde to 10.0 worked absolutely fine by maintaining the BSI tax Version for customizing setting (V10) and for master data and tax calculation (Feature: 10BSI - 10). Also created a parameter BSI_TF_VERSION with value 10 (T-Code: SU3). Maintaining the same configuration in SAP Prod didn't help. It gave an error: "Program error in remote function call of RFC_HRUS_TF_VERSION_90".
The only difference I found was that in Function UPAR1 parameter 2, the value in the payroll schema is TF and not VER as you have specified in the document. Please suggest.
Regards,
Snehi