How To Fix UC039 - The sender record produces duplicate keys

UC039 - Overview

• 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.

UC039 - Details

• 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