How To Fix DDLS206 - CASE (&): Nested CASE & does not supply consistent data type info

SAP Error Message - Details

• Message type: E = Error

• Message class: DDLS - For DDL source handling

• Message number: 206

• Message text: CASE (&): Nested CASE & does not supply consistent data type info

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DDLS206 - CASE (&): Nested CASE & does not supply consistent data type info ?

  The SAP error message DDLS206 indicates that there is an issue with a nested CASE statement in your SQL code. Specifically, the error message states that the nested CASE does not supply consistent data type information. This typically occurs when the THEN clauses of the CASE statement return different data types, which can lead to ambiguity in the result type.
  Cause:
  
  Inconsistent Data Types: The THEN clauses of the nested CASE statement return different data types. For example, one THEN clause might return an integer while another returns a string.
  NULL Values: If any of the THEN clauses can return NULL, it may lead to inconsistencies in the expected data type.
  Improper Nesting: The way the CASE statements are nested may not be structured correctly, leading to confusion in type resolution.
  
  Solution:
  To resolve the error, you should ensure that all THEN clauses in the nested CASE statement return the same data type. Here are some steps to follow:
  
  
  Check Data Types: Review the THEN clauses of your CASE statements and ensure they all return the same data type. If necessary, use type conversion functions (like CAST or CONVERT) to ensure consistency.
  Example:
  CASE 
      WHEN condition1 THEN CAST(value1 AS VARCHAR)
      WHEN condition2 THEN CAST(value2 AS VARCHAR)
      ELSE 'default_value'
  END
  
  
  Use a Common Data Type: If you have different data types, consider converting them to a common type that can accommodate all possible values.
  
  
  Simplify Nested CASE: If possible, simplify the nested CASE statements. Sometimes breaking them down into separate statements or using simpler logic can help avoid type conflicts.
  
  
  Test Each CASE: Test each CASE statement independently to ensure they return the expected data types.
  
  
  Related Information:
  
  Documentation: Refer to the SAP documentation for SQL syntax and the CASE statement to understand the expected behavior and data types.
  Debugging: Use debugging tools or SQL execution plans to trace the execution of your SQL code and identify where the type mismatch occurs.
  SAP Notes: Check for any relevant SAP Notes or community forums for similar issues and solutions provided by other users.
  
  By ensuring that all branches of your CASE statements return consistent data types, you should be able to resolve the DDLS206 error.