How To Fix /AIF/MES321 - Non-existence check failed; selection from &1 returns a result

SAP Error Message - Details

• Message type: E = Error

• Message class: /AIF/MES -

• Message number: 321

• Message text: Non-existence check failed; selection from &1 returns a result

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.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

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.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message /AIF/MES321 - Non-existence check failed; selection from &1 returns a result ?

  The SAP error message /AIF/MES321 Non-existence check failed; selection from &1 returns a result typically occurs in the context of the Application Interface Framework (AIF) when there is an issue with the data validation or existence checks during the processing of messages. This error indicates that a non-existence check, which is supposed to confirm that a certain record does not exist in the database, has failed because the selection query returned a result.
  Cause:
  
  Data Integrity Issues: The record that the system expected not to exist is actually present in the database. This could be due to incorrect data entry, duplicate records, or issues with data migration.
  Configuration Errors: The configuration settings for the AIF interface might be incorrect, leading to improper checks being performed.
  Business Logic Violations: The business rules defined in the AIF might be violated, causing the system to expect a non-existent record when it actually exists.
  Incorrect Mapping: If the mapping of the data fields is incorrect, it may lead to unexpected results during the existence check.
  
  Solution:
  
  Check the Database: Investigate the database table referenced by &1 in the error message. Verify if the record that is causing the issue actually exists. If it does, determine whether it should exist based on your business logic.
  Review AIF Configuration: Check the AIF configuration settings to ensure that the non-existence checks are set up correctly. This includes reviewing the interface definitions and the associated mappings.
  Adjust Business Logic: If the existence check is based on specific business rules, ensure that these rules are correctly implemented and that the data being processed adheres to them.
  Data Cleanup: If there are duplicate or erroneous records in the database, consider cleaning up the data to resolve the issue.
  Debugging: If the issue persists, you may need to debug the AIF processing to understand why the existence check is failing. This may involve looking at the code or configuration that performs the check.
  
  Related Information:
  
  Transaction Codes: You may want to use transaction codes like SLG1 (Application Log) to check for detailed logs related to the error.
  AIF Documentation: Refer to SAP documentation on AIF for more details on how to configure and troubleshoot interfaces.
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that might address this specific error or provide additional troubleshooting steps.
  Community Forums: Consider searching or posting on SAP Community forums for insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to identify the root cause of the error and implement a suitable solution.