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Hi,
Can you please define ODataKeyfields ( https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/developer/properties/devenv-odatakeyfields-property) property for this API page? Also make sure that your EntityName and EntitySameName are unique.
Check detailed steps on how to create custom API here - https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/developer/devenv-develop-custom-api#to-create-api-pages-to-display-car-brand-and-car-model
You can check a similar post here - https://community.dynamics.com/forums/thread/details/?threadid=289bc806-5c52-f011-877b-6045bdeb8a5d
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