How To Fix CNV761 - Unique secondary index & of table & can cause duplicates.

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV - Conversion: Messages for Conversion Services (CNCC)

• Message number: 761

• Message text: Unique secondary index & of table & can cause duplicates.

What causes this issue?

A unique secondary index was found.

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?

Make sure that the index does not cause any duplicates,
or use transaction CNV_OPT to earmark the index for automatic dropping
during the conversion.
(Choose pushbutton 'Table-spec. index handling' to select and save the
indexes that you want to drop.)

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV761 - Unique secondary index & of table & can cause duplicates. ?

  The SAP error message CNV761 indicates that there is a potential issue with a unique secondary index on a database table that could lead to duplicate entries. This error typically arises during data migration or conversion processes, particularly when using SAP's Data Migration tools or during the execution of certain programs that manipulate data in a way that could violate the uniqueness constraints of the index.
  Cause:
  
  Data Duplication: The data being migrated or processed may contain duplicate entries that violate the uniqueness of the secondary index.
  Index Definition: The secondary index is defined in such a way that it expects unique values, but the incoming data does not meet this requirement.
  Data Model Changes: Changes in the data model or structure of the table may lead to conflicts with existing data and the defined indexes.
  
  Solution:
  
  
  Identify Duplicates: Before proceeding with the migration or data processing, run a query to identify any duplicate entries in the data set that could cause the issue. You can use SQL queries to check for duplicates based on the fields that are part of the unique index.
  Example SQL query:
  SELECT field1, field2, COUNT(*)
  FROM your_table
  GROUP BY field1, field2
  HAVING COUNT(*) > 1;
  
  
  Data Cleansing: Once duplicates are identified, you will need to cleanse the data. This may involve:
  
  Removing duplicates.
  Merging records.
  Modifying data to ensure uniqueness.
  
  
  
  Adjust Index: If the unique constraint is not necessary, consider adjusting the index definition to allow for non-unique values. However, this should be done with caution and a clear understanding of the implications.
  
  
  Review Migration Logic: If the error occurs during a migration process, review the logic of the migration to ensure that it correctly handles potential duplicates and adheres to the constraints of the target database.
  
  
  Testing: After making the necessary adjustments, perform thorough testing to ensure that the changes resolve the issue without introducing new problems.
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific guidance or patches related to the CNV761 error. SAP frequently updates its knowledge base with solutions for common issues.
  Data Migration Tools: Familiarize yourself with the tools and methodologies used for data migration in SAP, such as SAP S/4HANA Migration Cockpit, SAP Data Services, or LSMW (Legacy System Migration Workbench).
  Database Constraints: Understand the implications of unique constraints and indexes in your database design, as they play a crucial role in maintaining data integrity.
  
  By following these steps, you should be able to resolve the CNV761 error and ensure that your data migration or processing runs smoothly without violating the uniqueness constraints of your database tables.