How To Fix CD036 - The underlying structure &1 has no key field

SAP Error Message - Details

• Message type: E = Error

• Message class: CD - Change Documents

• Message number: 036

• Message text: The underlying structure &1 has no key field

What causes this issue?

When creating a change document object, the system checks if key fields
were also available for the structures to be generated.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

If no key fields are available, generation of the change document
object must be terminated as otherwise the system performs a short dump
when writing change documents.

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CD036 - The underlying structure &1 has no key field ?

  The SAP error message CD036, which states "The underlying structure &1 has no key field," typically occurs in the context of data modeling or when working with certain SAP applications that require a key field in a structure. This error indicates that the structure you are trying to use does not have a defined key field, which is necessary for the system to uniquely identify records.
  Cause:
  
  Missing Key Field: The structure referenced in the error message does not have a key field defined. Key fields are essential for uniquely identifying records in a database table or structure.
  Incorrect Structure Usage: The structure may not be intended for the operation you are trying to perform, or it may not be properly configured.
  Data Model Issues: If you are working with a data model (like in SAP BW or similar), the underlying structure may not be set up correctly.
  
  Solution:
  
  
  Define a Key Field:
  
  If you have access to the ABAP Dictionary (transaction SE11), you can check the structure in question. 
  Open the structure and ensure that at least one field is marked as a key field. You can do this by selecting a field and marking it as a key field in the structure definition.
  
  
  
  Check Structure Usage:
  
  Ensure that the structure is being used in the correct context. If it is not meant to have a key field, consider using a different structure that meets the requirements of your operation.
  
  
  
  Consult Documentation:
  
  Review the documentation for the specific SAP module or application you are working with to understand the requirements for key fields in structures.
  
  
  
  Contact SAP Support:
  
  If you are unable to resolve the issue, consider reaching out to SAP support or your internal SAP team for assistance. They may provide insights specific to your system configuration.
  
  
  
  Related Information:
  
  Transaction Codes: SE11 (Data Dictionary), SE80 (Object Navigator) can be used to check and modify structures.
  Key Fields in SAP: Key fields are crucial for database integrity and performance, as they allow for efficient data retrieval and manipulation.
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional context.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.