https://help.tallysolutions.com/docs/te9rel60/Tax_India/VAT/Puducherry/PY_Overriding_AV_VAT_Invoice.htm

Overriding Assessable Value and Tax in Invoice (Puducherry)

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

To record transaction by overriding tax details

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

2.    Click F12: Configure to configure the sales invoice for overriding tax details.

o     Set Use common ledger A/c for item allocation? to No.

o     Set Allow modification of Tax Details for VAT? to Yes.

o     Press Ctrl+A to accept the screen.

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

4.    Select the required stock items whose VAT rates are specified either at the stock group or stock item level. Enter Quantity and Rate for each stock item.

o     Select a common sales ledger in which the option Is VAT/CST Applicable? is set to Applicable, and Set/Alter VAT Details? is disabled in the Accounting Details screen.

o     Click F12: Configure in VAT Classification Details screen to configure override of tax rate.

o     Select the Classification/Nature in VAT Details screen.

o     Enter the required Tax rate. The VAT Details screen appears as shown below:

o     Press Enter to return to invoice.

5.    Select the common VAT ledger.

The sales invoice appears as shown below:

6.    Press O to override the default tax details and save invoice with the changed tax rate.