If the user is already registered under 'Composition Scheme' but software still calculates the tax on it then it can easily be corrected in the multiple bills at once. 

In order to know the process, the user needs to follow the given steps:

Note: If the user is registered under 'Composition Scheme' from the date of purchased GST number then only the user can follow these steps. However, if initially the user was under 'Registered Scheme' of GST and then has been converted into 'Composition Scheme' then the tax will remain same in the previous bills.

• Go to Reports > Management Reports > Utilities > Multi Editing > Multi Changes in Old Bills.

• If showing Sorry! You are not Authorised to use this option Please click

• A 'Multi Transfer' window will appear. In 'Type' option, the user will select type of transaction in which the tax needs to be updated.

• Suppose, select 'Sale'.

• The user will Enter Date Range as per the requirement.

• Then click on 'Accept'.

• Again a 'Multi Transfer' window will appear. Press the Space bar to select a bill or Press (*) key to select all bills.

• Then press 'F6' on it.

• Then select 'Change with Current Tax'.

• Then a 'Be Careful' window will appear with some options as below:

1. Change: Select whether the tax needs to be changed in all transactions, w/o brk/exp repl and only brk/exp repl.

Suppose, select 'All'.

2. Type < SURE >:  Type 'SURE' in order to change Tax with current tax.

Then press 'Enter' on it.

After following the above steps, the selected sale bill's Tax will get updated with the current tax.