How To Fix DMC_RT_MSG170 - Secondary index contains duplicate values; portion &1

DMC_RT_MSG170 - Overview

• Message type: E = Error

• Message class: DMC_RT_MSG - DMC: Runtime Object Messages

• Message number: 170

• Message text: Secondary index contains duplicate values; portion &1

What causes this issue?

During an initial load, you are using transfer behavior 3 (Array
Modify). At least one record in an access plan portion cannot be
inserted or updated, as this would violate a unique secondary index for
the target table.

System Response

The system does not transfer any records from the failed portions to the
target system, but continues transferring the other access plan
portions, and sets the status of the table to <ZK>Failed</>.

How to fix this error?

Remove the unique secondary index from the target table, or change it to
a non-unique secondary index. Then reset the status of table in the
central system. The central system will try to transfer the failed
portions again.

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

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 DMC_RT_MSG170 - Secondary index contains duplicate values; portion &1 ?

  The SAP error message DMC_RT_MSG170 indicates that there are duplicate values in a secondary index for a specific portion of data. This typically occurs during data processing or data migration tasks, particularly when working with the Data Migration Cockpit (DMC) or similar tools in SAP.
  
  Cause:
  The error is caused by the presence of duplicate entries in the secondary index of a database table. This can happen due to various reasons, such as:
  
  Data Quality Issues: The source data may contain duplicates that were not identified or cleaned before the migration or processing.
  Incorrect Mapping: During data migration, the mapping of fields may not be set up correctly, leading to duplicates being created in the target system.
  Concurrency Issues: If multiple processes are trying to insert or update records simultaneously, it may lead to duplicate entries.
  Configuration Errors: The configuration of the secondary index may not be set up to handle unique constraints properly.
  
  
  Solution:
  To resolve the