C_TS4FI Financial Accounting Practice Question
What is the primary function of the 'Posting Key' in FI document entry?
⚠ Common exam trap
Candidates often incorrectly believe posting keys only dictate debit and credit sides, ignoring their critical role in controlling account types and screen field status during the document entry process.
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 defines whether a line item is a debit or a credit.
The posting key is a powerful control mechanism in SAP that determines whether a line item is a debit or credit, the account type (e.g., Vendor, G/L), and which fields appear on the screen during document entry. By controlling these aspects, the posting key ensures that accounting entries are consistent and that the correct data is gathered for every transaction type.
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 document number range.
Why it's wrong here
Document number ranges are determined by the document type in the header, not by the posting key. The posting key operates at the line item level, whereas the document type provides the overarching structure for the entire transaction, including its identifier and numbering convention for the financial records.
- ✓
It defines whether a line item is a debit or a credit.
Why this is correct
The posting key is the technical switch that tells the system whether the entry is a debit or credit. This assignment is fundamental to the double-entry bookkeeping logic of the system, ensuring that every financial document remains balanced by enforcing the rules defined in the configuration for each key.
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It controls the fiscal year variant used for the entry.
Why it's wrong here
Fiscal year variants are assigned to company codes at the organizational level. They are not influenced by the posting key chosen for a specific line item. The system relies on the company code's configuration to determine the fiscal year logic, independent of the individual line item's posting key.
- ✗
It links the asset class to the G/L account.
Why it's wrong here
Linking asset classes to G/L accounts is handled by the account determination configuration in Asset Accounting. The posting key merely dictates how the transaction is posted (debit/credit) and which account types can be entered, rather than defining the specific account mapping logic within the asset management sub-ledger.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official SAP exam blueprint
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