How To Fix SADL_EXPOSURE021 - Exactly one reference element allowed for COUNT_DISTINCT

SAP Error Message - Details

• Message type: E = Error

• Message class: SADL_EXPOSURE - Errors During Exposure Compilation

• Message number: 021

• Message text: Exactly one reference element allowed for COUNT_DISTINCT

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SADL_EXPOSURE021 - Exactly one reference element allowed for COUNT_DISTINCT ?

  The SAP error message SADL_EXPOSURE021 indicates that there is an issue with the use of the COUNT_DISTINCT function in your SAP Data Access Layer (SADL) query. Specifically, this error occurs when the COUNT_DISTINCT function is applied to more than one reference element, which is not allowed.
  Cause:
  The COUNT_DISTINCT function is designed to count unique occurrences of a single reference element. If you attempt to use it with multiple reference elements, the system cannot determine which element to count, leading to this error.
  Solution:
  To resolve this error, you need to ensure that the COUNT_DISTINCT function is applied to only one reference element. Here are the steps you can take:
  
  
  Review Your Query: Check the query where the COUNT_DISTINCT function is being used. Identify the reference elements involved.
  
  
  Modify the Query: If you find that multiple reference elements are being used with COUNT_DISTINCT, modify the query to ensure that only one reference element is passed to the function. For example:
  
  Instead of using COUNT_DISTINCT(element1, element2), change it to COUNT_DISTINCT(element1) or COUNT_DISTINCT(element2) depending on which one you need to count.
  
  
  
  Test the Query: After making the changes, test the query to ensure that it executes without errors and returns the expected results.
  
  
  Related Information:
  
  Documentation: Refer to the SAP documentation for SADL and the specific functions you are using. This can provide additional context and examples of correct usage.
  SAP Notes: Check for any relevant SAP Notes that might address this error or provide additional guidance on using COUNT_DISTINCT.
  Community Forums: If you continue to have issues, consider reaching out to SAP community forums or support channels where you can get assistance from other SAP users or experts.
  
  By following these steps, you should be able to resolve the SADL_EXPOSURE021 error and successfully use the COUNT_DISTINCT function in your queries.