How To Fix CNVMBT260 - Could not insert record into table &1 because entry already existed.

CNVMBT260 - Overview

• Message type: E = Error

• Message class: CNVMBT - Messages for MBT/API/PCL

• Message number: 260

• Message text: Could not insert record into table &1 because entry already existed.

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.

CNVMBT260 - Details

• The SAP error message CNVMBT260 indicates that there was an attempt to insert a record into a database table, but the operation failed because an entry with the same key already exists in that table. This error typically occurs during data migration or data transfer processes, especially when using tools like SAP's Migration Cockpit or other data migration solutions.
  
  Cause:
  
  Duplicate Data: The most common cause is that the data being imported or migrated contains duplicate entries that violate the unique constraints of the target table.
  Incorrect Mapping: There may be an issue with the mapping of source data to the target structure, leading to attempts to insert records that already exist.
  Data Consistency Issues: The source data may not be clean or consistent, leading to duplicates being present in the dataset.
  Previous Migration Attempts: If a migration process was previously run and not completed successfully, it may have left some records in the target