Usually, when a transaction is posted, for example, a vendor invoice (document type: KR), the system posts the ‘Gross’ amount with the ‘tax’ and ‘discount’ included. However, SAP provides you the option of posting these items as ‘Net.’ In this case, the posting excludes ‘tax’ or ‘discounts.’ Remember to use the special document type KN. (Similarly, you will use the document type DN for ‘customer invoice-Net’ compared to the normal invoice postings for the customer using the document type DR.) For using this ‘net method’ of posting you should have activated the required settings in the customization.