Reverse Charge in Service Tax

Dear Experts,

I need your help for the following scenario:

1. Vendor gives me bill for Rs. 100 and Charge ST@25% of 12.36% i.e. Rs. 3.09

2. Due to change in Service Tax law, rest Rs. 9.27 I need to make payment directly to Service Tax Authority.

So for the first scenario I've created a Tax Code for 3.09% in Service Tax. How can I trigger second entry automatically? Is there any configuration for the same.

I use SAP B1 8.82 PL10

Thanks in advance,

Rahul