How To Fix IDCN020 - ALV list cannot be displayed

SAP Error Message - Details

• Message type: E = Error

• Message class: IDCN -

• Message number: 020

• Message text: ALV list cannot be displayed

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

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Smart SAP Assistant

• What is the cause and solution for SAP error message IDCN020 - ALV list cannot be displayed ?

  The SAP error message IDCN020, which states "ALV list cannot be displayed," typically occurs when there is an issue with the display of an ALV (ABAP List Viewer) report. This can happen for various reasons, and understanding the cause is essential for finding a solution. Here are some common causes and their respective solutions:
  Causes:
  
  Missing or Incorrect Data: The underlying data for the ALV report may be missing or not correctly fetched, leading to an inability to display the list.
  Authorization Issues: The user may not have the necessary authorizations to view the data or execute the report.
  Technical Issues: There may be technical issues with the SAP GUI or the ALV function module itself.
  Memory Issues: Insufficient memory allocation for the ALV report can lead to display issues.
  Incorrect Configuration: The ALV report may not be correctly configured in the system.
  
  Solutions:
  
  Check Data Availability: Ensure that the data source for the ALV report is populated and accessible. You can run the underlying transaction or report to verify that data is available.
  Review Authorizations: Check the user’s authorizations to ensure they have the necessary permissions to execute the report and view the data.
  Restart SAP GUI: Sometimes, simply restarting the SAP GUI can resolve temporary glitches that may cause display issues.
  Check Memory Settings: If the report is large, consider increasing the memory settings in the SAP system or optimizing the report to handle large datasets more efficiently.
  Debugging: If you have access to the ABAP code, you can debug the report to identify where the issue occurs. Look for any exceptions or errors in the code that may prevent the ALV from displaying.
  Check for Notes and Patches: Look for SAP Notes or patches related to the specific ALV function module or report you are using. Sometimes, SAP releases updates to fix known issues.
  Consult SAP Support: If the issue persists, consider reaching out to SAP support for assistance, especially if it appears to be a bug or a more complex issue.
  
  Related Information:
  
  ALV Function Modules: Familiarize yourself with the ALV function modules like REUSE_ALV_LIST_DISPLAY or REUSE_ALV_GRID_DISPLAY, as understanding their parameters can help in troubleshooting.
  SAP Community: The SAP Community forums can be a valuable resource for finding similar issues and solutions shared by other users.
  Documentation: Review the official SAP documentation for ALV reporting to ensure that you are following best practices in report design and execution.
  
  By systematically checking these areas, you should be able to identify and resolve the issue causing the IDCN020 error message.