https://help.tallysolutions.com/docs/te9rel63/Tax_India/VAT/Assam/AS_Alter_AV_Tax_Invoice.htm

Overriding Assessable Value and Tax in Invoice (Assam)

In case you want to override the assessable value and tax rate in invoice, allow modification of tax details in F12: configure.

To override the assessable value and tax in an invoice

1. Go to Gateway of Tally > Accounting Vouchers > F8: Sales > Tax Invoice .

2. Click F12: Configure to configure the sales invoice.

3. Select the party ledger in Party's A/c Name option.

4. Enter Party Details , as required.

5. Select the Name of Item from the List of Stock Items . Enter the Quantity and Rate .

6. Select the sales ledger in Accounting Details screen, and press Enter .

7. Click F12:Configure in VAT Details screen.

8. Select the Classification/Nature in VAT Details screen.

9. Enter the required Tax Rate and Assessable Value . The VAT Details screen appears as shown below:

10. Press Ctrl+A to accept the VAT Details screen, and Accounting Details screen.

11. Select the VAT ledger . The sales invoice appears as shown below:

12. Press O to override.