When purchasing from a composition dealer, you should not apply the tax rate, and GST should not be calculated. In that case, you need to follow the below steps:
Step 1: First, make sure you add a new party master for the composition dealer by pressing F3 in the party option in the voucher window, or you can add it from Administration, then select Masters, then select Account, then select Add. In that window, you should select the dealer type as composition.
Step 2: Also, you have to create one purchase type for the composition dealer by pressing F3 in the purchase type option in the voucher window, or you can add it by going to Administration, then selecting Masters, then selecting Purchase Type, then selecting Add. In that window, you should select the taxation type as composition dealer.
Step 3: After making sure of the above settings, you can pass relevant information for purchase entries from a composition dealer, like date, voucher number, and item details, and save the entry.
The above setting will help post the voucher for the composition dealer while purchasing.