C_TS4FI Financial Accounting Practice Question
Which functionality in SAP S/4HANA allows you to define a 'Default Account Assignment' for cost elements without requiring manual input during posting?
⚠ Common exam trap
Test-takers often confuse OKB9 default account assignments with substitution rules or validation rules, assuming complex custom logic is required for cost object derivation.
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
✓
Transaction OKB9.
Transaction OKB9 is the standard configuration tool for defining default cost centers or internal orders for cost elements. This is vital for streamlining the document entry process and ensuring that all P&L postings are attributed to a cost object. This automated derivation reduces manual entry errors and ensures that management accounting reports are always populated with valid data for operational analysis and decision-making.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Substitution Rules (GGB1).
Why it's wrong here
Substitution rules can perform complex logic to replace field values during document posting. While they could theoretically be used to assign cost centers, they are overkill for simple defaults and are harder to maintain than the dedicated OKB9 configuration, which is the standard, best-practice approach for this specific requirement.
- ✓
Transaction OKB9.
Why this is correct
Transaction OKB9 is the dedicated configuration step for defining default cost account assignments. It allows for the assignment of cost centers or internal orders to G/L accounts based on company code or business area, ensuring that all postings are automatically assigned to the correct cost objects without manual intervention by users.
- ✗
Validation Rules (OB28).
Why it's wrong here
Validation rules are used to check the accuracy of data before it is posted, not to provide default values. They will flag an error if a field is missing, but they cannot automatically fill in the missing cost center during the posting process, making them unsuitable for automating assignments.
- ✗
Field Status Groups.
Why it's wrong here
Field status groups control whether a field is optional, required, or hidden during document entry. While they can make the cost center field mandatory, they cannot provide a default value. They are purely for enforcing data entry compliance and do not have the logic to derive or populate information automatically.
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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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