How To Fix DMCLG121 - &1 already exists and cannot be created again

SAP Error Message - Details

• Message type: E = Error

• Message class: DMCLG - DMC Tool Development

• Message number: 121

• Message text: &1 already exists and cannot be created again

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 DMCLG121 - &1 already exists and cannot be created again ?

  The SAP error message DMCLG121 indicates that there is an attempt to create an object (such as a document, record, or entry) that already exists in the system. This error typically arises in scenarios involving data management, document management, or similar modules where unique identifiers are required for each entry.
  Cause:
  
  Duplicate Entry: The most common cause is that the system is trying to create a new entry with an identifier (like a name, ID, or key) that already exists in the database.
  Data Migration Issues: If data is being migrated or imported into the system, there may be conflicts with existing records.
  User Error: Users may inadvertently attempt to create the same entry multiple times.
  System Configuration: There may be issues with the configuration of the system that allow for duplicate entries to be attempted.
  
  Solution:
  
  Check Existing Entries: Before creating a new entry, check the existing records to ensure that the identifier you are trying to use is not already in use.
  Use Unique Identifiers: Ensure that the identifiers you are using for new entries are unique. This may involve generating new IDs or modifying existing ones.
  Data Cleanup: If duplicates exist in the system, consider cleaning up the data to remove or consolidate duplicate entries.
  Review Migration Processes: If this error occurs during data migration, review the migration scripts or processes to ensure they handle existing records appropriately.
  Consult Documentation: Refer to SAP documentation or support for specific guidelines related to the module you are working with, as there may be additional constraints or requirements.
  Error Handling in Code: If you are developing custom code, implement error handling to check for existing entries before attempting to create new ones.
  
  Related Information:
  
  Transaction Codes: Depending on the module, you may use specific transaction codes to view existing entries (e.g., SE11 for Data Dictionary, SE16 for table display).
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  Support Forums: Engage with SAP community forums or support channels for additional insights and solutions from other users who may have encountered the same issue.
  
  If the problem persists after trying the above solutions, it may be beneficial to contact SAP support for further assistance.