How To Fix E4066 - Message & not copied because message & already exists

E4066 - Overview

• Message type: E = Error

• Message class: E4 - Program maintenance functions within development system

• Message number: 066

• Message text: Message & not copied because message & already exists

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message E4066 - Message & not copied because message & already exists ?

  The SAP error message E4066, which states "Message & not copied because message & already exists," typically occurs when you are trying to copy a message (usually a text message or error message) in the SAP system, but a message with the same identifier already exists in the target message class.
  
  Cause:
  
  Duplicate Message ID: The primary cause of this error is that the message you are trying to copy has the same message number as an existing message in the target message class.
  Message Class Conflict: If you are copying messages from one message class to another, and the target message class already contains a message with the same number, the system will prevent the copy operation to avoid overwriting existing messages.
  
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Existing Messages:
  
  Go to transaction SE91 (Message Class Maintenance) and check the target message class to see if the message number you