How To Fix TK278 - Table key (class &3) is in the customer namespace

SAP Error Message - Details

• Message type: E = Error

• Message class: TK - Transport Organizer

• Message number: 278

• Message text: Table key (class &3) is in the customer namespace

What causes this issue?

Key &V2& of table &V1& (delivery class &V3&) is in the customer
namespace (see table TRESC).

System Response

You cannot include the key in the requests.

How to fix this error?

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message TK278 - Table key (class &3) is in the customer namespace ?

  The SAP error message TK278 indicates that there is an issue with a table key that is located in the customer namespace. This typically occurs when you are trying to create or modify a table key in a way that conflicts with the naming conventions or restrictions of the SAP system.
  Cause:
  
  Customer Namespace Conflict: The error arises when you attempt to use a table key that is defined in the customer namespace (usually starting with "Z" or "Y") in a way that is not allowed by the system.
  Incorrect Table Key Definition: The table key may not be defined correctly, or it may be trying to reference a key that is not valid or does not exist.
  Modification of Standard Objects: If you are trying to modify a standard SAP object or table key that is not meant to be changed, this error can occur.
  
  Solution:
  
  Check Table Key Definition: Review the definition of the table key you are trying to use. Ensure that it is correctly defined and does not conflict with existing keys.
  Use Correct Namespace: If you are creating a new table key, ensure that you are using the correct namespace. If it is a custom development, it should be in the customer namespace (Z or Y).
  Avoid Modifying Standard Objects: If you are attempting to modify a standard SAP object, consider creating a custom object instead. This will help avoid conflicts with the standard SAP namespace.
  Consult Documentation: Refer to SAP documentation or help resources for guidance on naming conventions and best practices for defining table keys.
  Check for Existing Keys: Ensure that the key you are trying to create does not already exist in the system. You can do this by checking the relevant tables in the Data Dictionary (SE11).
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes like SE11 (Data Dictionary), SE14 (Database Utility), or SE80 (Object Navigator) to investigate and resolve the issue.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance.
  Development Guidelines: Familiarize yourself with SAP's development guidelines regarding the use of customer namespaces and table key definitions to prevent similar issues in the future.
  
  If the problem persists after following these steps, consider reaching out to your SAP Basis or development team for further assistance.