In an excise invoice, the actual quantity may include stock items which are free of cost. Billed quantity in such invoices excludes the stock items which are given for free. Excise duty is charged on the actual quantity, regardless of the billed quantity. However, you can change the assessable value in the invoice.
To change the assessable value
1. Click F12: Configure in excise sales invoice.
2. Enable the option Allow modification of Tax Details for Excise?.
3. Press Ctrl+A to save.
In the excise sales invoice, press Enter from the Amount column to view the Excise Assessable Value screen and enter the required assessable value for excise duty calculation.