Excise Payable is not getting Knocked-off by respective Excise A/c on shipping

 We have assigned 'Excise Payable'a/c on Organization Additional Information Form and 'Excise Basic 8%'on the tax form.
When we perform 'O2C'process to generate the transaction in AR, the entry is
not getting knocked-off with Excise Payable & Individual Taxes taken in sales
order.
 
System will generate an entry as follows
Receivable Dr
Revenue Cr.
Excise Basic 8% Cr the entry of excise payable as follows

Excise Payable Dr.
Cenvat R/M Cr.

But in trial we see the equal amount "excise payable" and "excise basic 8%" in Dr. and Cr.
respectively.