For the bonus from supplier, if the bonus is reflected in the invoice.
You may include it when creating ‘New Purchase Invoice’ as shown above.
First, you key the actual purchase item. Second you key the bonus item without any cost.
If the bonus item is not reflected in invoice or is given after the transaction.
You will first key in the actual purchase item in the invoice. After which you proceed to Batch and Adjustment to add the bonus item.