A system may include generation of extension metadata defining an extension field of a core node of a business object, and generation of a runtime metadata buffer comprising enhanced metadata, the enhanced metadata based on core metadata of the business object and the extension metadata. In some aspects, a service request associated with the business object is received, it is determined whether the service request is associated with the extension field, an extension service associated with a dynamic data type is provided if it is determined that the service request is associated with the extension field, wherein the dynamic data type is associated with extension data of the extension field and core data of the business object, and a core service associated with an original data type is provided if it is determined that the service request is not associated with the extension field.