How To Fix ED156 - Function not supported when modifying structures

SAP Error Message - Details

• Message type: E = Error

• Message class: ED - ABAP/4 Editor messages

• Message number: 156

• Message text: Function not supported when modifying structures

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 ED156 - Function not supported when modifying structures ?

  The SAP error message ED156 ("Function not supported") typically occurs when you attempt to modify a structure in a way that is not allowed by the system. This can happen in various contexts, such as when working with data dictionary objects or when trying to change the structure of a table or view that is not modifiable.
  Causes:
  
  Non-modifiable Structures: The structure you are trying to modify may be a standard SAP structure or a structure that is locked for modification.
  Transport Layer Issues: If the structure is part of a transport request that is not released or is in a different transport layer, modifications may be restricted.
  Authorization Issues: You may not have the necessary authorizations to modify the structure.
  System Restrictions: Certain system settings or configurations may prevent modifications to specific structures.
  
  Solutions:
  
  Check Structure Type: Verify if the structure is a standard SAP structure. If it is, you may need to create a Z-structure (custom structure) instead of modifying the standard one.
  Use Custom Structures: If you need to add fields or make changes, consider creating a custom structure (Z-structure) that extends the functionality you need.
  Authorization Check: Ensure that you have the necessary authorizations to modify the structure. You may need to contact your SAP security team to verify your permissions.
  Transport Request: If the structure is part of a transport request, ensure that the request is released and that you are working in the correct transport layer.
  Consult Documentation: Check SAP Notes or documentation related to the specific structure you are trying to modify for any known issues or restrictions.
  
  Related Information:
  
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address this specific error or provide additional context.
  Transaction Codes: Use transaction codes like SE11 (Data Dictionary) to view the structure and its properties.
  Debugging: If you have access, you can debug the program or transaction that is causing the error to get more insights into why the modification is failing.
  
  If the issue persists after trying the above solutions, consider reaching out to SAP support for further assistance.