How To Fix DDANNO003 - Header annotations are not permitted in entity extensions

DDANNO003 - Overview

• Message type: E = Error

• Message class: DDANNO - CDS annotations

• Message number: 003

• Message text: Header annotations are not permitted in entity extensions

Self-Explanatory Message

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DDANNO003 - Details

• The SAP error message DDANNO003: Header annotations are not permitted in entity extensions typically occurs in the context of SAP's ABAP programming model, particularly when working with CDS (Core Data Services) views or OData services. This error indicates that there is an issue with the annotations defined in an entity extension.
  
  Cause:
  The error arises when you attempt to define header annotations (such as @UI.headerInfo) in an entity extension. In SAP, entity extensions are meant to extend the properties of an existing entity, but they do not allow for the addition of header annotations. Header annotations are typically defined at the level of the original entity and not in its extensions.
  
  Solution:
  To resolve this error, you should follow these steps:
  
  
  Remove Header Annotations from the Extension: Check the entity extension where the error is occurring and remove any header annotations that you have defined there. Ensure that all header-related annotations are only present in