How To Fix S~028 - One of the tables contains duplicate keys.

SAP Error Message - Details

• Message type: E = Error

• Message class: S~ - Repository API Business Navigator

• Message number: 028

• Message text: One of the tables contains duplicate keys.

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 S~028 - One of the tables contains duplicate keys. ?

  The SAP error message S~028, which states "One of the tables contains duplicate keys," typically occurs when there is an attempt to insert or update records in a database table that has a unique key constraint, and the operation would result in duplicate entries for that key.
  Cause:
  
  Duplicate Data: The most common cause is that the data being inserted or updated already exists in the table with the same key values.
  Incorrect Data Handling: There may be issues in the data handling logic, such as not properly checking for existing records before attempting to insert new ones.
  Data Migration Issues: If data has been migrated from another system, it may contain duplicates that violate the unique constraints of the target SAP table.
  Concurrency Issues: In a multi-user environment, two users might be trying to insert the same record simultaneously.
  
  Solution:
  
  Identify Duplicates: Use SQL queries to identify existing records in the table that have the same key values as the data you are trying to insert or update. For example:
  SELECT * FROM your_table WHERE key_column = 'value';
  
  Data Validation: Before performing insert or update operations, validate the data to ensure that it does not already exist in the table.
  Modify Data: If duplicates are found, you may need to modify the data you are trying to insert or update to ensure it is unique.
  Error Handling: Implement error handling in your code to catch this error and provide a user-friendly message or take corrective action.
  Data Cleanup: If the duplicates are due to data migration or existing data issues, consider cleaning up the data in the database to remove duplicates.
  Review Business Logic: Ensure that the business logic that generates or processes the data is correctly designed to avoid creating duplicates.
  
  Related Information:
  
  Unique Constraints: Understand the unique constraints defined on the table. You can check the table definition in the Data Dictionary (SE11) to see which fields are part of the unique key.
  Transaction Logs: Review transaction logs or application logs to trace back the operations that led to the error.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  Debugging: If you are a developer, consider debugging the code that leads to this error to understand the flow of data and where duplicates might be introduced.
  
  By following these steps, you should be able to resolve the S~028 error and prevent it from occurring in the future.