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Posting Keys in SAP: What Do 40, 50, 31 and 01 Mean?

Posting Keys in SAP: What Do 40, 50, 31 and 01 Mean?

Two digits, three determinations: the posting key defines the account type, the posting side and the field status for every line item. It is barely visible in the Fiori apps, but always present in the document display. This article explains the key posting keys, the logic behind their numbering, and why two of them are enough for G/L accounts.

10.08.2026 Read more →
What Is a Document Flow in SAP and Why Does It Matter?

What Is a Document Flow in SAP and Why Does It Matter?

Every posting in SAP creates a document, and documents belonging to the same transaction are automatically linked. Understanding this principle helps you answer questions like "Why can't I reverse this document?" or "Where is the payment?" independently. This article explains the document flow concept, walks through two practical examples, and clarifies what changed in S/4HANA.

22.06.2026 Read more →

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