How To Fix DDLS258 - CAST is not supported for current expression, for ex., aggregate function

DDLS258 - Overview

• Message type: E = Error

• Message class: DDLS - For DDL source handling

• Message number: 258

• Message text: CAST is not supported for current expression, for ex., aggregate function

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DDLS258 - CAST is not supported for current expression, for ex., aggregate function ?

  The SAP error message DDLS258 indicates that there is an issue with the use of the CAST function in your SQL statement, particularly when it involves an aggregate function. This error typically arises in the context of ABAP Dictionary or when working with SQL views in SAP.
  
  Cause:
  The error occurs because the CAST function is not supported for certain expressions, especially when they involve aggregate functions. Aggregate functions (like SUM, AVG, COUNT, etc.) return a single value from a set of values, and attempting to cast the result of such functions directly can lead to this error.
  
  Solution:
  To resolve this error, you can consider the following approaches:
  
  
  Remove the CAST: If the data type of the aggregate function's result is already suitable for your needs, you may not need to cast it at all. Simply remove the CAST from your SQL statement.
  
  
  Use a Subquery: If you need to cast the result of an