C_TS4FI Financial Accounting Practice Question
What is the function of the 'Posting Key' in SAP S/4HANA?
⚠ Common exam trap
Candidates frequently assume the posting key only controls debit/credit indicators, forgetting its critical role in determining the account type (e.g., Customer, Vendor, G/L) for the line item.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It determines the account type for the line item.
The posting key is a fundamental control element in SAP. It dictates whether a line item is a debit or credit, which account type is affected, and other critical transaction behaviors. Understanding posting keys is essential for any financial accountant, as they ensure that accounting entries are balanced and that data flows into the correct subsidiary ledgers, which is vital for accurate financial reporting.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It determines the fiscal year.
Why it's wrong here
The fiscal year is determined by the posting date in the document header. Posting keys have no role in time-based fiscal controls; they are strictly used to control the technical characteristics of a line item posting, such as the debit/credit nature and the account type interaction.
- ✓
It determines the account type for the line item.
Why this is correct
Posting keys tell the system whether the entry is for a customer, vendor, asset, or G/L account. This allows the system to validate the account number and ensure that the transaction follows the correct accounting rules, preventing inconsistent data entries that could compromise the accuracy of financial statements.
- ✗
It defines the tax rate for the invoice.
Why it's wrong here
Tax rates are handled by tax codes, not posting keys. Using a posting key to attempt to control tax rates would be ineffective and logically incorrect, as the posting key describes the debit/credit nature of the movement, while the tax code manages the fiscal calculation of the entry.
- ✗
It stores the document currency.
Why it's wrong here
Document currency is established at the document header level. Posting keys do not store currency information. They merely ensure that the line item adheres to the structural rules of the account type it is posting to, and they are not designed to influence currency-related logic in the system.
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Last reviewed September 2026 · checked against the official SAP exam blueprint
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