How To Fix SDDL_PARSER_MSG456 - Entity "&1" can contain only key fields with type "LANG"

SAP Error Message - Details

• Message type: E = Error

• Message class: SDDL_PARSER_MSG - Message Class for DDL Parser

• Message number: 456

• Message text: Entity "&1" can contain only key fields with type "LANG"

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SDDL_PARSER_MSG456 - Entity "&1" can contain only key fields with type "LANG" ?

  The SAP error message SDDL_PARSER_MSG456 indicates that there is an issue with the definition of an entity in the SAP system. Specifically, it states that the entity "&1" can only contain key fields of type "LANG". This typically occurs in the context of defining data models or structures in SAP, particularly when working with language-dependent data.
  Cause:
  The error is triggered when you attempt to define a key field in an entity that is not of type "LANG". In SAP, language-dependent fields are often used to store text or descriptions that vary based on the language settings of the user or the system. The key fields for such entities must be defined as language fields to ensure proper handling of multilingual data.
  Solution:
  To resolve this error, you should:
  
  
  Check the Entity Definition: Review the definition of the entity that is causing the error. Ensure that all key fields are defined correctly and that they are of type "LANG" where required.
  
  
  Modify Key Fields: If you find that any key fields are not of type "LANG", you will need to modify them. Change the data type of the key fields to "LANG" if they are intended to be language-dependent.
  
  
  Review Data Model: If you are working with a data model or a custom development, ensure that the overall design adheres to SAP's guidelines for language-dependent entities.
  
  
  Consult Documentation: Refer to SAP documentation or help resources for more information on defining entities and the requirements for key fields.
  
  
  Testing: After making the necessary changes, test the entity to ensure that the error no longer occurs and that the entity behaves as expected.
  
  
  Related Information:
  
  Language Fields in SAP: In SAP, language fields are typically used for text elements that need to be displayed in multiple languages. The data type "LANG" is specifically designed for this purpose.
  Entity Definitions: When defining entities in SAP, especially in the context of ABAP or data modeling, it is crucial to follow the conventions and requirements set by SAP to avoid runtime errors.
  SAP Notes and Community: If you continue to experience issues, consider searching for SAP Notes related to this error or asking for help in the SAP Community forums, where other users and SAP experts can provide assistance.
  
  By following these steps, you should be able to resolve the error and ensure that your entity is correctly defined for language-dependent data handling.