Document Types 
Document Types
The document type is used for the following functions in General Ledger Accounting (FI-GL), Accounts Receivable (FI-AR), and Accounts Payable (FI-AP) components:
All vendor invoices, for example, are posted using the same document type.
This is the main function of the document type. You must specify a number range for every document type. The original documents from a number range are stored together.
For more information, see
The document type determines whether or not the net procedure is used when posting a vendor invoice. With the vendor net procedure for posting, the system automatically subtracts cash discount from the corresponding offsetting entries when the document is posted.
The document type is entered in the document header and applies to the whole document.
Document types are defined at client level. The standard system already contains document types which you can use or change.
The system usually defaults the appropriate document type when a business transaction is entered. These default values are defined in the system. With some transactions (such as clearing procedures), you define document types in the system that are required for automatic postings but which are not defaulted during entry. Before deleting document types, check whether they are currently used in the system.