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AL Compilation error: "The namespace 'TableName' is unknown" when creating a flowfield

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Posted on by Ghetz

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So I create an extension with a table object. Then I want to add a flowfield to the /Sales invoice Header/ based on this new table, and I get compilation error /The namespace 'TableName' is unknown/ (AL0791), so I can't compile my extension. Any ideas? I've noticed this only happens when calcformula es /count/ or /exists/; if I use sum, there is no compiler error.

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YUN ZHU 81,757 Super User 2025 Season 1 on at

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AL Compilation error: "The namespace 'TableName' is unknown" when creating a flowfield

Hi, I briefly summarized it, and I hope the following information can give you some tips.

Dynamics 365 Business Central: The namespace ‘xxxx’ is unknown in CalcFormula Property

https://yzhums.com/51298/

Thanks.

ZHU
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Saurav.Dhyani 14,314 Super User 2025 Season 1 on at

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AL Compilation error: "The namespace 'TableName' is unknown" when creating a flowfield

Hi,

It seems a bug, I would recommend reporting it to Microsoft.

Regards,

Saurav Dhyani

https://bit.ly/SubscribeSauravYouTube
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YUN ZHU 81,757 Super User 2025 Season 1 on at

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AL Compilation error: "The namespace 'TableName' is unknown" when creating a flowfield

I simply tested it and found that this problem does exist. .

But since it is Count, if you remove the following "No." field, the error will disappear.

Hope this helps.

Thanks.

ZHU
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Saurav.Dhyani 14,314 Super User 2025 Season 1 on at

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AL Compilation error: "The namespace 'TableName' is unknown" when creating a flowfield

Hi,

Check all objects in your extension.

There seems an object where you have defined namespaces (it may happen if you use AZ/AL Extension to develop new objects).

If you find namespace my table, remove that from that object.

That should fix the problem.

Regards,

Saurav Dhyani

https://bit.ly/SubscribeSauravYouTube
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Mohamed Amine Mahmoudi 22,108 Super User 2025 Season 1 on at

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AL Compilation error: "The namespace 'TableName' is unknown" when creating a flowfield

Hi @Ghetz,

I think you must add a name space Microsoft.Sales.History.

using Microsoft.Sales.History;

Best regards,

Mohamed Amine MAHMOUDI