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Dynamics 365 Community / Forums / Small and medium business | Business Central, N... / AL Compilation error: ...
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Suggested Answer

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

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Posted on by Ghetz 3,029
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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  • Suggested answer
    Mohamed Amine Mahmoudi Profile Picture
    Mohamed Amine Mahmoudi 26,811 Super User 2026 Season 1 on at
    Hi @Ghetz,
     
    I think you must add a name space Microsoft.Sales.History.
    using Microsoft.Sales.History;
    Best regards,
    Mohamed Amine MAHMOUDI
  • Suggested answer
    Saurav.Dhyani Profile Picture
    Saurav.Dhyani 14,419 User Group Leader on at
    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
  • Suggested answer
    YUN ZHU Profile Picture
    YUN ZHU 102,590 Super User 2026 Season 1 on at
    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
  • Suggested answer
    Saurav.Dhyani Profile Picture
    Saurav.Dhyani 14,419 User Group Leader on at
    Hi,
     
    It seems a bug, I would recommend reporting it to Microsoft.
     
    Regards,
    Saurav Dhyani
  • Suggested answer
    YUN ZHU Profile Picture
    YUN ZHU 102,590 Super User 2026 Season 1 on at
    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
     
    Thanks.
    ZHU

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