Types of Cash Discount Clearing 
Use
This function uses the document type to control how cash discount
is to be cleared.The standard system contains two document types:
The cash discount amount is not taken into consideration when the invoice is entered.
Only when payment is made, is the cash discount amount posted to a revenue account.
The cash discount amount is credited directly to the account that the costs are posted to when you enter the invoice. For example, if you are posting an amount to a cost center, only the invoice amount minus the cash discount amount is posted to the cost center.
Prerequisites
The following settings are made in Customizing for Logistics Invoice Verification:
(Invoice Verification ® Logistics Invoice Verification ® Incoming Invoice ® Maintain Document Types and Number Ranges ® Document Type)
Activities
The Logistics Invoice Verification screen appears.
.The system then determines the terms of payment from the first purchase order allocated.
If a fixed cash discount is specified in the invoice, you can enter this amount in the field Cash disc. In this case, the system ignores the terms of payments that the system proposes or that you enter.
You can change the default document type in the header area, on the tab page Details.