A supplier bill is rarely a simple quantity times rate. There is usually a trade discount on some lines, GST at different rates, and packaging charged at the end. Entered carelessly, your stock cost and your input GST both end up wrong.
When you choose a product on the purchase form, its purchase price and GST rate fill in from the product, so you only change what differs on this bill.
Put the discount percentage on the lines it applies to. GST is calculated on the discounted value, which is how the supplier's invoice works. The cost recorded for your stock is the net cost after discount.
If the supplier is in your state, the tax shows as CGST and SGST. If not, it shows as IGST. The software decides from the supplier's state and your company state.
Enter packaging as a separate charge with its own GST rate, before the subtotal, so it is taxed correctly and included in the bill total.
After posting, you are asked whether to print barcode labels for what arrived, one per unit received.
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