How To Fix SDME_MDB306 - &1 already exists under the alias &2

SAP Error Message - Details

• Message type: E = Error

• Message class: SDME_MDB - DME: Maintenance Dialog Builder

• Message number: 306

• Message text: &1 already exists under the alias &2

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.

Smart SAP Assistant

• What is the cause and solution for SAP error message SDME_MDB306 - &1 already exists under the alias &2 ?

  The SAP error message SDME_MDB306 indicates that there is a conflict with an existing entry in the system. Specifically, it means that an object (such as a material, customer, or vendor) already exists under a specified alias, which is causing a duplication issue.
  Cause:
  The error typically arises in scenarios where:
  
  You are trying to create or modify an entry in the SAP system that already exists.
  There is an attempt to assign an alias to an object that is already associated with another entry.
  Data inconsistencies or duplicate entries in the database.
  
  Solution:
  To resolve the SDME_MDB306 error, you can take the following steps:
  
  
  Check Existing Entries:
  
  Use transaction codes like SE11 (Data Dictionary) or SE16 (Data Browser) to check the database tables related to the object you are trying to create or modify.
  Look for the entry that corresponds to the alias mentioned in the error message.
  
  
  
  Modify or Delete Existing Entry:
  
  If the existing entry is valid and should remain, consider modifying your new entry to avoid the conflict.
  If the existing entry is a duplicate or no longer needed, you may delete it or change its alias.
  
  
  
  Use a Different Alias:
  
  If possible, try using a different alias for the new entry you are trying to create. This can help avoid the conflict with the existing entry.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or help files related to the specific module you are working with (e.g., SD - Sales and Distribution) for more context on the error.
  
  
  
  Check for Custom Developments:
  
  If your organization has custom developments or enhancements, check if any custom logic is causing the conflict.
  
  
  
  Contact SAP Support:
  
  If you are unable to resolve the issue, consider reaching out to SAP support for assistance, especially if this is a recurring problem.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes that can help you navigate the data and troubleshoot the issue.
  SAP Notes: Search for SAP Notes related to the error message for any patches or updates that may address the issue.
  User Permissions: Ensure that you have the necessary permissions to view and modify the entries in question.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.