Hi Experts,
I noticed that some Posted Sales Invoice numbers are missing when reviewing the posted sales invoice list in Microsoft Dynamics 365 Business Central.
Since posted sales invoice numbers are generated automatically from the configured No. Series, I have the following questions:
- What are the common reasons for missing posted sales invoice numbers?
- Under what scenarios does Business Central reserve or skip invoice numbers?
- Can this happen because of posting errors, transaction rollbacks, session timeouts, or system interruptions?
- Is there any standard functionality or log that helps identify why a specific posted invoice number was skipped?
- What is the recommended approach for explaining these missing numbers during statutory or external audits?
- Are there any Microsoft best practices or documentation that auditors generally accept as evidence?
For example, if the sequence is:
Invoice IBV2526/MH/P0125,125 is missing. Since there is no posted document with that number, how do you justify this gap to auditors, and how can you determine the actual reason it was skipped?
I would appreciate any insights, best practices, or real-world experiences from the community.

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