How To Fix SDDL_PARSER_MSG019 - $$EXTENSION is not allowed within unions

SAP Error Message - Details

• Message type: E = Error

• Message class: SDDL_PARSER_MSG - Message Class for DDL Parser

• Message number: 019

• Message text: $$EXTENSION is not allowed within unions

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SDDL_PARSER_MSG019 - $$EXTENSION is not allowed within unions ?

  The SAP error message SDDL_PARSER_MSG019 indicates that there is an issue with the use of the $$EXTENSION keyword within a union in your SAP Data Dictionary (DDIC) or in your ABAP code. This error typically arises when you are trying to define a union that includes an extension, which is not permitted in the context of the union definition.
  Cause:
  The error occurs because the $$EXTENSION keyword is not allowed in union definitions. Unions in SAP are used to combine multiple data types or structures, but they have specific rules regarding what can be included. The presence of $$EXTENSION suggests that you are trying to include an extension of a structure or data type that is not compatible with the union's requirements.
  Solution:
  To resolve this error, you need to review the union definition and ensure that you are not including any extensions. Here are the steps you can take:
  
  
  Check the Union Definition: Look at the code or data dictionary definition where the union is defined. Identify where $$EXTENSION is being used.
  
  
  Remove the Extension: If you find that $$EXTENSION is included in the union, you will need to remove it. Instead, use only the base types or structures that are allowed in the union.
  
  
  Refactor the Code: If you need to include additional fields or extensions, consider refactoring your code. You might need to create a separate structure or use a different approach to achieve your goal without violating the union rules.
  
  
  Test the Changes: After making the necessary changes, test the code or data dictionary object to ensure that the error is resolved and that the functionality remains intact.
  
  
  Related Information:
  
  Documentation: Refer to the SAP documentation for unions and data types to understand the rules and limitations regarding their usage.
  SAP Community: You can search for similar issues in the SAP Community forums, where other developers may have encountered and resolved the same error.
  ABAP Development Guidelines: Familiarize yourself with best practices in ABAP development, especially regarding data types and structures, to avoid similar issues in the future.
  
  By following these steps, you should be able to resolve the SDDL_PARSER_MSG019 error and ensure that your union definitions comply with SAP's requirements.