Purchase invoices are incoming invoices. This is the final step of the incoming business cycle.
Purchasing Document Types in the system standard are listed below.
PPC - Purchase Invoice
RSL - Sales Return Invoice
PPR - Receivable Note
PPI - Credit Note (Cost Increase)
Purchase Invoice
A purchase invoice is a commercial document presented to the buyer by the seller or service provider for payment within a specified time period, showing what was purchased, in what quantity and at what price.
Sales Return Invoice
Sales Return is the process of returning sold products back to the seller.
For sales return transaction, a sales return invoice is issued to indicate that the goods or material has been returned to the vendor.
Receipt Note
If the price on the outgoing invoice (sales invoice) is higher than the previously agreed price, a credit note is issued by the seller to the buyer reflecting the price difference.
You (the seller) can create a credit note to reflect the price difference.
The credit note will create a credit to the receivable account (your customer).
Credit Note (Cost Increase)
After the normal sales transaction, if for any reason the seller (you) and the customer agree on a price lower than the price on the sales invoice, a credit note should be recorded reflecting the price difference. Since this difference increases the cost (depending on your perspective), this is called a markup (cost overrun).