Entering Business Transactions in General Ledger Accounting 
Procedure
To enter a business transaction in General Ledger Accounting using the standard transaction, from the SAP Easy Access screen, choose Accounting
® Financial accounting ® General ledger ® Document entry ® Others ® General posting.Also enter the posting key and the vendor account number of the first line item. Save your entries.

The posting key and the field status group for the G/L account determine which fields are displayed on the next screen.

The posting key and the account number at the end of each screen determine which fields are displayed on the next screen for entering a line item.
See also:
Entering G/L Account Line Items (General Ledger) Posting Documents in General Ledger Accounting