How To Fix CL_SADL_GW_MDE_MSG029 - Property & is not allowed in CDS or was already used

SAP Error Message - Details

• Message type: E = Error

• Message class: CL_SADL_GW_MDE_MSG -

• Message number: 029

• Message text: Property & is not allowed in CDS or was already used

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message CL_SADL_GW_MDE_MSG029 - Property & is not allowed in CDS or was already used ?

  The SAP error message CL_SADL_GW_MDE_MSG029 typically occurs when there is an issue with the definition of a Core Data Services (CDS) view, particularly when it comes to the use of properties in the context of the SAP Gateway and the SADL (Service Adaptation Definition Language) framework.
  Cause:
  This error message indicates that a property (or field) is either:
  
  Not allowed in the context of the CDS view you are trying to create or modify.
  Already used in a way that conflicts with the current definition or usage in the CDS view.
  
  Common causes include:
  
  Using a property that is not defined in the underlying data model.
  Attempting to use a property that is already defined in the CDS view but is being referenced again in a conflicting manner.
  Misconfiguration in the annotations or the structure of the CDS view.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Property Definitions: Review the properties defined in your CDS view. Ensure that all properties you are using are valid and correctly defined in the underlying data model.
  
  
  Avoid Duplicates: Make sure that you are not trying to define the same property multiple times in the CDS view. Each property should have a unique definition.
  
  
  Review Annotations: Check the annotations in your CDS view. Ensure that they are correctly applied and do not conflict with the properties you are trying to use.
  
  
  Consult Documentation: Refer to the SAP documentation for CDS views and SADL to understand the constraints and rules regarding property usage.
  
  
  Debugging: If the issue persists, consider debugging the CDS view to identify where the conflict arises. You can use transaction codes like SE11 or SE80 to analyze the CDS view definition.
  
  
  SAP Notes: Check for any relevant SAP Notes or updates that might address this specific error or provide additional guidance.
  
  
  Related Information:
  
  CDS Views: Core Data Services are a way to define semantically rich data models in SAP. They allow for the creation of views that can be consumed by various applications, including SAP Fiori.
  SADL: The Service Adaptation Definition Language is used to adapt data models for use in OData services, allowing for the creation of services that can be consumed by SAP Gateway.
  SAP Gateway: This is a technology that allows for the creation of OData services, enabling communication between SAP systems and external applications.
  
  If you continue to face issues, consider reaching out to your SAP support team or consulting with an SAP expert who can provide more tailored assistance based on your specific environment and configuration.