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Code unit properties

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Posted on by RS-09051127-0

Hello all,

Can anyone please explain the property Access = Internal in code units?

How and when to use it?

What is the purpose of using it?

Thanks.

Regards,

Reshma.

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Dynamics 365 Business Central

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YUN ZHU 92,443 Super User 2025 Season 2 on at

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Code unit properties

Just add an example,

Standard code:

Your extension: 'Codeunit System.Utilities."Image Impl."' is inaccessible due to its protection level

Thanks.

ZHUY

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Teddy Herryanto (Th... 14,197 Super User 2025 Season 2 on at

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Code unit properties

Declaring a codeunit as Internal means that no other app can use that codeunit and its procedures.

You can use it to prevent other apps from calling the codeunit procedure. This is mainly done for AppSource apps. Modifying the procedure properties is considered "Breaking Change" and can affect other apps that rely on that procedure. By making the codeunit internal, you can modify the procedures without worrying about other apps.

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Gerardo Rentería Ga... 23,574 Most Valuable Professional on at

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Code unit properties

Hi

Here some more information, I hope help you.

Dynamics 365 Business Central: AL and the internalsVisibleTo property – Stefano Demiliani

Dynamics 365 Business Central: Can we access the standard internal table/field (Access Property = Internal) via AL??? | Dynamics 365 Lab (yzhums.com)

Access Modifiers in Dynamics 365 Business Central (youtube.com)

BR

GR

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Mohamed Amine Mahmoudi 26,316 Super User 2025 Season 2 on at

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Code unit properties

Hi,

Best regards,

Mohamed Amine MAHMOUDI

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KasparsSemjonovs 4,661 Super User 2025 Season 2 on at

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Code unit properties

Seems it is explained here:
Access Property - Business Central | Microsoft Learn

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