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fields in web api query require leading undersore & trailing "_value"

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Posted on by wilson_smyth

Im writing a web query to get information from a custom entity in Dynamics.
I checked the entity field names in dynamics and wrote the following query:

https://MyDynamicsSite/MyOrg/api/data/v8.1/org_customEntity15?$select=org_customer

This query does not return anything for org_customer field, despite it being the correct name of the field in the entity.

If i use CRM REST Builder to create my query it looks like this:
https://MyDynamicsSite/MyOrg/api/data/v8.1/org_customEntity15?$select=_org_customer_value

Note the leading underscore and trailing "_value" in the field name in the select.

Where does CRM REST BUILDER get this "correct" field name from, as i cannot find it anywhere within dynamics?

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wilson_smyth on at

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RE: fields in web api query require leading undersore & trailing "_value"

realized that the webapi does this for any lookups. microsoft documentation says it does this for "certain types", but doesnt specify what these types are.