G/L Account Number (Accounts Payable) 
G/L Account Number (Accounts Payable)
The account number is the G/L account you are posting a line item to, such as the office supplies expense account, 476000. You can use search help to find G/L account numbers. See Working with the R/3 system for more information on searching for accounts with matchcodes.
After you enter a posting key and a G/L account number and select
ENTER , the next screen with extra fields for G/L account items is displayed.