Posting a Document in General Ledger Accounting 
If the debits equal the credits, you can have the system post the document. When you post the document, the system saves it and updates the G/L account balances. After you choose Post, the system checks whether:
If the debits do not equal the credits, the system prevents you from posting.
The steps for entering and posting documents are as follows:
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G/L account posting·
Foreign currency valuationThe "Incoming payment", "Outgoing payment", and "Post with clearing" options are clearing functions.
The posting key and the field status group for the G/L account determine which fields appear on the next screen.
At least two G/L account line items are required.
The system updates the document file and the G/L account balances.