How To Fix MDG_DT_DATA_MODEL026 - Cannot insert value; a duplicate key may exist

SAP Error Message - Details

• Message type: E = Error

• Message class: MDG_DT_DATA_MODEL - Messages for the Configuration Workbench Model Access API

• Message number: 026

• Message text: Cannot insert value; a duplicate key may exist

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message MDG_DT_DATA_MODEL026 - Cannot insert value; a duplicate key may exist ?

  The SAP error message MDG_DT_DATA_MODEL026 indicates that there is an attempt to insert a value into a database table that violates a unique constraint, which typically means that a duplicate key already exists in the table. This error is common in Master Data Governance (MDG) scenarios where unique identifiers (like IDs or codes) are expected to be unique across the dataset.
  
  Cause:
  
  Duplicate Key Violation: The most common cause is that the value you are trying to insert already exists in the database. This could be a primary key or a unique index that is being violated.
  Data Entry Error: There may be a mistake in the data entry process, where the same record is being submitted multiple times.
  Data Migration Issues: If data is being migrated from another system, there may be duplicates in the source data that are not being handled correctly.
  Concurrency Issues: If multiple users or processes are trying to insert