Error when developing a custom API

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Posted on by Jan de Mul

Goodafternoon,

I'm learning how to create a custom API for Business Central.

For this i'm using this guide by Microsoft, it all goes OK and runs without debugging.

However when I run the first POST request via Postman i receive the error as shown at the bottom (in postman).

I think it's an issue with the permissions but can't figure out how to solve it, i've created a permission set that gives full access to both tables and assigned it to my user.

Thanks in advance for your help.

{
    "error": {
        "code": "Internal_ServerError",
        "message": "Sorry, the current permissions prevented the action. (TableData 50100 Car Brand Insert: ALProject3)  CorrelationId:  8aaa02c2-3766-438d-a065-03f89e3c7."
    }
}
 
 

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Dynamics 365 Business Central

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Jan de Mul 69 on at

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There's no error when sending the GET request

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Aymen CHELBI 574 on at

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Hello,

I suggest you check the following points below :

Permission Set: Ensure that your custom permission set includes Insert, Modify, Delete, and Read for TableData 50100 Car Brand.

API Category & Publishing: If your API is not correctly categorized or published, it may not be accessible. Verify that it's properly exposed.

OAuth & Authentication: Ensure that your Postman request is authenticated correctly with an OAuth token that has the necessary permissions.

Environment Restart: Sometimes, permission changes don’t take effect immediately. Try restarting Business Central or reassigning the permission set.

If you've already done all of this, can you share your API page and permission set definitions? That might help pinpoint the issue.

Best regards,

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Steven Renders 5,672 Moderator on at

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Add a permissionset to your app:

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Gerardo Rentería Ga... 25,225 Most Valuable Professional on at

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Hi

Please review this section, add your extension's permission.

Best

GR

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Khushbu Rajvi. 20,439 Super User 2025 Season 2 on at

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Generate permission set for the specific extension and then assign that extension into permission sets in Microsoft entra application page.

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Khushbu Rajvi. 20,439 Super User 2025 Season 2 on at

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Generate permission set:

Assign extension into the permission set

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