Posting key in SAP is used to control the entry of a document line item. In SAP a posting key determines the account type, debit and credit of a line item and the screen layout or filed status of the entry screen. While posting a document to Sap you need to enter a posting key before entering each line items and by that the debit and credit entry of the item will be known to … [Read more...] about How to create a posting key in SAP