What is a ‘Posting Key’?

A ‘Posting Key’ (Transaction Code is OB41) in SAP is a 2-digit alphanumeric key that controls the entry of line items. SAP comes with many posting keys for meeting the different business transaction requirements: 40 (GL debit), 50 (GL credit), 01 (customer invoice), 11 (customer credit memo), 21 (vendor credit memo), 31 (vendor payment), etc.

The posting key determines:

  1. What account can be posted to
  2. Which side of the account (debit or credit) to be posted to, and
  3. What ‘layout’ screen needs to be used for that particular transaction.

It is a normal practice not to change any of the default posting keys in the system, as
you would very rarely require additional posting keys.

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