# Account Number Sequence Check

Check the chart of accounts for duplicate numbers and gaps in the sequence.

## Scope
Preparation and review only. No account action or professional decision.

## Inputs
The chart of accounts with account numbers and names.

## Workflow
1. List the accounts and their numbers.
2. Sort by number.
3. Mark duplicate numbers and unexpected gaps.
4. Return the check without ledger changes.

## Output contract
account | number | duplicate | gap_before | verdict

## Fictional acceptance test
Fictional chart holds 120 accounts; 2 different expense accounts both carry the number 6100: 2 accounts sharing 1 number, so postings split unpredictably.

## Review gates
Keep original values, source IDs and version dates. Unknown facts stay held. Use qualified review for hiring, legal and accounting conclusions. No send, share, sign-in, scheduling, ledger change or payment. Fictional contract review is not a live account compatibility test.

## Method source
https://quickbooks.intuit.com/learn-support/en-us/help-article/chart-accounts/learn-chart-accounts-quickbooks-online/L2yc6KBob_US_en_US

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