TDS Deduction on Gross without Service Tax component only

Hello Experts,

We are using SAP, ECC 6, for our Engg. & Construction industry

As per existing tax procedure (TAXINN), Final Vendor Invoice amount for TDS Deduction was Basic Invoice amount + Excise + VAT / CST + Ser. Tax, &in the same tax key was NVV for all, means all cost we are inventories

Now, as per Service Tax dept. Circular 1/2014 dated 13.01.2014,

Only the amount of Service Tax should be excluded at the time of calculation of TDS on Vendor Invoice, means TDS should get calculated on Basic Invoice amount + VAT & Excise if any and Service tax should be excluded.

we did the below changes for the same...

     1)  Defining Withholding Tax Type for ECESS at Invoice Posting -  "Modif. net amount".

     2) Withholding Tax Base Amount--Define Processing Key for Modified Net Amount -  TDS Codes with TAX Key - NVV

but here problem is, Tax key was not separate Service Tax, so system calculate TDS on service tax component also, which we want to exclude...

Is there any solution? Is there any configuration?

Thanks

Regards.

Jitendra K.Surana