The answer is that the account combination used is not valid in the chart of accounts. This is the most likely cause because Dynamics 365 Finance enforces strict account validation rules during invoice posting; if the combination of main account, department, cost center, or other financial dimensions does not exist in the chart of accounts structure, the system blocks the posting to maintain ledger integrity. On the Microsoft Dynamics 365 Fundamentals ERP MB-920 exam, this concept tests your understanding of how financial dimensions and account structures govern transaction processing, often appearing as a trap where candidates confuse approval status or vendor holds with account validation. A common memory tip is to remember that account validation is about the *structure* of the account string, not the *status* of the invoice or vendor—think “invalid combo, no posting.”
MB-920 Describe Dynamics 365 Finance Practice Question
This MB-920 practice question tests your understanding of describe dynamics 365 finance. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
During a month-end close, a Dynamics 365 Finance user encounters an error when trying to post a vendor invoice. The invoice has been approved but the system shows 'Invoice posting failed due to account validation'. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The account combination used is not valid in the chart of accounts.
Option A is correct because invalid account combinations are a common cause of posting failures. Option B is wrong because invoice approval status does not affect account validation. Option C is wrong because vendor holds prevent payment, not posting. Option D is wrong because general ledger journal entries are not directly related.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The vendor is on hold in accounts payable.
Why it's wrong here
Vendor holds prevent payment, not posting.
✗
The invoice has not been approved by the workflow.
Why it's wrong here
Approval status does not affect account validation.
✗
The general ledger journal for the invoice is not yet posted.
Why it's wrong here
General ledger journal entries are not directly related.
✓
The account combination used is not valid in the chart of accounts.
Why this is correct
Invalid account combinations trigger account validation errors during posting.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related MB-920 NAT questions on configuration and troubleshooting.
Describe Dynamics 365 Finance — This question tests Describe Dynamics 365 Finance — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The account combination used is not valid in the chart of accounts. — Option A is correct because invalid account combinations are a common cause of posting failures. Option B is wrong because invoice approval status does not affect account validation. Option C is wrong because vendor holds prevent payment, not posting. Option D is wrong because general ledger journal entries are not directly related.
What should I do if I get this MB-920 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related MB-920 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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