The EDM Properties correspond to the Smart 3D attributes.
Their properties are discoverable using the $metadata document for the EDM and can fully participate in any OData system query option.
When returning an entity that represents an underlying Smart 3D user type object, any properties defined only on the user type and not on the base class are returned as dynamic properties. Because these are not structural properties, they are not represented in the $metadata document generated for the EDM and OData query options involving these properties are limited to only $select statements. For example:
URI - <Service Root>/Sites?$select=Id,Status
An open property Status is returned when Site, Catalog or Plant is shown in response only if the entity is
not in up to date or ready or usable state. The value of this property depicts the
reason for this entity to not be in Ready state.