How To Fix /SMB/CONT_RESTRUCT156 - Key of table &1 obtains a field of datatype LANG

SAP Error Message - Details

• Message type: E = Error

• Message class: /SMB/CONT_RESTRUCT -

• Message number: 156

• Message text: Key of table &1 obtains a field of datatype LANG

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SMB/CONT_RESTRUCT156 - Key of table &1 obtains a field of datatype LANG ?

  The SAP error message /SMB/CONT_RESTRUCT156 indicates that there is an issue with a key of a table that is trying to obtain a field of datatype LANG. This typically occurs in the context of data structures or database tables where a language field is being used incorrectly as part of a key.
  Cause:
  
  
  Key Definition: The error arises when a field of type LANG (which is used to store language keys) is included in the key definition of a table or structure. In SAP, language fields are not allowed to be part of the primary key or unique key of a table because they are not unique across different languages.
  
  
  Data Model Issues: This can happen during the restructuring of a table or when trying to create a new table or structure that incorrectly includes a language field in its key.
  
  
  Custom Development: If you are working with custom tables or structures, this error may arise from incorrect definitions in the ABAP Dictionary.
  
  
  Solution:
  
  
  Review Table Structure: Check the definition of the table or structure that is causing the error. Ensure that no fields of type LANG are included in the key definition.
  
  
  Modify Key Fields: If a language field is part of the key, you will need to remove it from the key definition. You can do this by:
  
  Going to the Data Dictionary (SE11).
  Finding the table or structure in question.
  Modifying the key fields to exclude any fields of type LANG.
  
  
  
  Rebuild or Activate: After making the necessary changes, you may need to activate the table or structure again. If it is a custom development, ensure that all related objects are also updated accordingly.
  
  
  Testing: After making changes, perform thorough testing to ensure that the application behaves as expected and that the error no longer occurs.
  
  
  Related Information:
  
  Data Types in SAP: Understanding the different data types in SAP, especially how language fields are used, can help prevent similar issues in the future.
  SAP Notes: Check for any relevant SAP Notes that might provide additional context or solutions for this error.
  Documentation: Review SAP documentation regarding table design and best practices for defining keys in database tables.
  
  If you continue to experience issues after following these steps, consider reaching out to your SAP Basis or ABAP development team for further assistance.