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Documented navigation properties are not available

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Posted on by CU07050406-0

Hi there,

I'm trying to query the Items API, going off the docs here: https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/api-reference/v2.0/resources/dynamics_item

Specifically, the navigation properties, here: https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/api-reference/v2.0/resources/dynamics_item#navigation

The documentation lists numerous properties that are not available.

For example, this HTTP request:

curl --request GET \
  --url 'https://api.businesscentral.dynamics.com/v2.0/<tenant-id>/Production/api/v1.0/companies(<company-id>)/items(<item-id>)?%24expand=itemCategory%2Cpicture%2CdefaultDimensions%2CitemVariants' \
  --header 'Authorization: Bearer <auth-token>'

Returns the item with all navigation properties filled (itemCategory, picture, defaultDimensions, itemVariants)

However, this HTTP request:

curl --request GET \
  --url 'https://api.businesscentral.dynamics.com/v2.0/<tenant-id>/Production/api/v1.0/companies(<company-id>)/items(<item-id>)?%24expand=unitOfMeasure%2CitemCategory%2Cpicture%2CdefaultDimensions%2CitemVariants' \
  --header 'Authorization: Bearer <auth-token>'

Returns:

{
	"error": {
		"code": "BadRequest",
		"message": "Could not find a property named 'unitOfMeasure' on type 'Microsoft.NAV.item'.  CorrelationId:  e5f99925-8842-4ccc-9295-13406d0e7cef."
	}
}

The linked documentation suggests that this property should be available.

Appreciating any insight with thanks,
Michael

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Dynamics 365 Business Central

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maxklein 12 on at

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Remove unitOfMeasure from the $expand list — it's not valid. Instead, either request baseUnitOfMeasure via $select, or build a custom API if deeper info is needed.

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maxklein 12 on at

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Please use api 2.0 for unitOfMeasure

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Matteo Fiocco 260 on at

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The issue isn’t with your request or token — the problem is that the unitOfMeasure navigation property is not actually exposed in the standard Business Central API, even though it's listed in the official documentation.

You can confirm this by checking the $metadata endpoint, which shows the actual structure and available properties of the API.

As a workaround, either use available fields like baseUnitOfMeasureCode, or create a custom API page in AL that includes unitOfMeasure as a navigation property if you need that relationship. Unfortunately, some navigation properties in the docs are planned or internal but not implemented in the public API.

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