How To Fix UC039 - The sender record produces duplicate keys

SAP Error Message - Details

• Message type: E = Error

• Message class: UC - FI/CO Data transfer: errors during transfer

• Message number: 039

• Message text: The sender record produces duplicate keys

What causes this issue?

During the data transfer, at least two data records with the same key
fields were sent.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Ensure that, during the data transfer, only data records with different
keys are sent, or, in the sender structure maintenance, allow 'double
keys' for the sender structure.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message UC039 - The sender record produces duplicate keys ?

  The SAP error message UC039, which states "The sender record produces duplicate keys," typically occurs in the context of data transfer or processing where unique keys are expected. This error indicates that the system has encountered multiple records that share the same key, which violates the uniqueness constraint required for the operation being performed.
  Cause:
  
  Duplicate Records: The most common cause is that the data being processed contains duplicate entries for the key fields that are supposed to be unique.
  Incorrect Data Mapping: If the data mapping or transformation logic is not correctly set up, it may lead to the generation of duplicate keys.
  Configuration Issues: There may be issues in the configuration of the data source or the target system that lead to the generation of duplicate keys.
  Data Quality Issues: Poor data quality, such as missing or incorrect identifiers, can also lead to duplicates.
  
  Solution:
  
  Identify Duplicates: Review the data being processed to identify the records that are causing the duplication. This can often be done using SQL queries or data analysis tools.
  Data Cleansing: Clean the data to remove duplicates. This may involve consolidating records, removing unnecessary duplicates, or ensuring that each record has a unique identifier.
  Adjust Data Mapping: If the issue is related to data mapping, review and adjust the mapping logic to ensure that it correctly handles unique keys.
  Configuration Review: Check the configuration settings in both the source and target systems to ensure that they are set up correctly to handle unique keys.
  Error Handling: Implement error handling in your data processing logic to manage duplicates gracefully, such as logging the errors and skipping duplicate records.
  
  Related Information:
  
  Transaction Codes: Depending on the context, you may need to use specific transaction codes (like SE11 for data dictionary, SE16 for table display) to investigate the underlying data.
  Data Sources: Check the source of the data (e.g., flat files, databases) to ensure that it does not contain duplicates before it is processed.
  SAP Notes: Look for relevant SAP Notes or documentation that may provide additional insights or patches related to this error.
  Testing: After making changes, conduct thorough testing to ensure that the issue is resolved and that no new issues have been introduced.
  
  By following these steps, you should be able to resolve the UC039 error and ensure that your data processing runs smoothly without encountering duplicate key issues.