How To Fix MT009 - & & is already defined

MT009 - Overview

• Message type: E = Error

• Message class: MT - Field Selection

• Message number: 009

• Message text: & & is already defined

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?

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MT009 - Details

• The SAP error message MT009 typically indicates that there is a problem with the material master data, specifically that a material with the same identifier (such as material number) is already defined in the system. This can occur in various contexts, such as during the creation of a new material or when trying to upload material data.
  
  Cause:
  
  Duplicate Material Number: The most common cause of this error is that the material number you are trying to create or upload already exists in the system.
  Incorrect Data Entry: There may be a typographical error in the material number you are trying to enter.
  Different Views: The material might exist in a different view or plant, which can lead to confusion if you are not aware of it.
  Data Migration Issues: If you are migrating data from another system, there may be duplicates that were not cleaned up before the migration.
  
  
  Solution:
  
  Check Existing Materials: Use transaction codes