BC 26 Upgrade - Missing fields in Table 386 Entry No. Amount Buffer

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Posted on by KI-09051132-0

Hi,

I’m currently upgrading from Business Central version 25.6 to 26.0 OnPrem, and I’m encountering an error when attempting to sync the new Base Application.

The error is as follows:
Type: System.InvalidOperationException
Message:
Table 386 Entry No. Amount Buffer :: The field 'Source Currency Code' cannot be located. Removing fields is not allowed.
Table 386 Entry No. Amount Buffer :: The field 'Source Currency Amount' cannot be located. Removing fields is not allowed.
Table 386 Entry No. Amount Buffer :: The field 'Source Currency VAT Amount' cannot be located. Removing fields is not allowed.
HResult: -2146233079

I’ve reviewed the obsoleted field list for version 26.0, but these fields are not mentioned there.

Since the environment contains a significant amount of data, I would prefer not to force the sync unless I can be sure it’s safe. (I do have a backup.)

Could you clarify:

Whether these fields were officially removed in version 26.0?

If so, what is the recommended approach to handle this during upgrade

Thank you in advance.

Best regards,

Kardo Ismail - Business Central Developer
ITm8 A/S
Denmark

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Dynamics 365 Business Central

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Sahib Dino 196 on at

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BC 26 Upgrade - Missing fields in Table 386 Entry No. Amount Buffer

Hi Kardo,

typically this coming issue arises when fields are removed or renamed in the base application between versions, but the metadata in your environment still references them so as i know least these three fields still exist in BC26.3 and have not been removed. I'm not sure if the id has changed, so please check these

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YUN ZHU 90,891 Super User 2025 Season 2 on at

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BC 26 Upgrade - Missing fields in Table 386 Entry No. Amount Buffer

Hi, as far as I know, at least these three fields still exist in BC26.3 and have not been removed. I'm not sure if the id has changed, you can compare it with BC25.

Thanks

ZHU

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DAnny3211 11,336 on at

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BC 26 Upgrade - Missing fields in Table 386 Entry No. Amount Buffer

Hi Kardo,

This issue typically arises when fields are removed or renamed in the base application between versions, but the metadata in your environment still references them — especially during upgrades with customizations or extensions.

Here's how to approach it:

Field Removal Confirmation:

As of version 26.0, the fields Source Currency Code, Source Currency Amount, and Source Currency VAT Amount in Table 386 Entry No. Amount Buffer are not listed as officially obsoleted in Microsoft’s documentation.

However, they may have been moved to another table, restructured, or deprecated internally without being flagged as obsolete.

Check for Customizations:

If your environment has custom extensions or modifications referencing these fields, they may be causing the sync error.

Review any tableextension objects or codeunits that interact with Table 386.

Recommended Upgrade Steps:

Do not force sync unless you're certain the fields are no longer needed and not referenced elsewhere.

Use the Schema Synchronization Mode = Upgrade cautiously and only after validating dependencies.

Consider using the Start-NAVDataUpgrade or Sync-NAVTenant with Force only in a test environment first.

Safe Resolution Path:

Backup your environment (as you've done — great!).

Create a temporary extension to log or isolate references to the missing fields.

If confirmed unused, remove or refactor those references before syncing.

Microsoft Support or Partner Guidance:

If the fields were removed without documentation, it’s worth raising a ticket with Microsoft or checking with your CSP partner for internal release notes.

Let me know if you'd like help reviewing your extension code or preparing a safe upgrade script!

Please verify if this response was helpful.

Best regards!

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Martin Dráb 236,025 Most Valuable Professional on at

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BC 26 Upgrade - Missing fields in Table 386 Entry No. Amount Buffer

Moved from Integration, Dataverse, and general topics forum to Small and medium business | Business Central, NAV, RMS forum.

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