How To Fix DDLS179 - After WHEN in CASE, literals, column, case, functions, paths allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: DDLS - For DDL source handling

• Message number: 179

• Message text: After WHEN in CASE, literals, column, case, functions, paths allowed

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DDLS179 - After WHEN in CASE, literals, column, case, functions, paths allowed ?

  The SAP error message DDLS179 typically occurs in the context of SQL statements, particularly when using the CASE statement in a SQL query. This error indicates that there is an issue with the syntax or structure of the CASE statement, specifically after the WHEN clause.
  Cause:
  The error message DDLS179 can be triggered by several factors, including:
  
  
  Incorrect Syntax: The WHEN clause may not be followed by a valid expression or literal. The SQL syntax requires that the WHEN clause is followed by a condition that evaluates to true or false.
  
  
  Invalid Data Types: The data types used in the CASE statement may not be compatible. For example, if you are comparing different data types without proper conversion, it can lead to this error.
  
  
  Missing or Incorrect Keywords: If there are missing keywords or if the structure of the CASE statement is not followed correctly, it can lead to this error.
  
  
  Use of Unsupported Functions: If you are using functions or expressions that are not supported in the context of the CASE statement, this can also trigger the error.
  
  
  Solution:
  To resolve the DDLS179 error, you can take the following steps:
  
  
  Check Syntax: Review the syntax of your CASE statement. Ensure that it follows the correct structure:
  CASE
      WHEN condition1 THEN result1
      WHEN condition2 THEN result2
      ...
      ELSE default_result
  END
  
  
  Validate Data Types: Ensure that the data types used in the WHEN conditions and the THEN results are compatible. If necessary, use type conversion functions to align the data types.
  
  
  Review Keywords: Make sure that all necessary keywords are present and correctly placed. For example, ensure that you have CASE, WHEN, THEN, and END in the correct order.
  
  
  Test with Simple Cases: If the CASE statement is complex, try simplifying it to isolate the issue. Start with a basic CASE statement and gradually add conditions to identify where the error occurs.
  
  
  Check for Unsupported Functions: Review the functions used within the CASE statement to ensure they are supported in the context you are using them.
  
  
  Related Information:
  
  Documentation: Refer to the SAP documentation for SQL syntax and the CASE statement for more detailed information on how to structure your queries correctly.
  SQL Reference: Familiarize yourself with SQL data types and conversion functions to avoid type-related issues.
  Debugging Tools: Use debugging tools or SQL query analyzers available in your SAP environment to help identify syntax errors.
  
  By following these steps, you should be able to identify and resolve the cause of the DDLS179 error in your SQL queries.