How To Fix DMC_MD_XSD003 - Duplicate field: field &1 already exists in BO &2 and structure &3

SAP Error Message - Details

• Message type: E = Error

• Message class: DMC_MD_XSD - XSD messages

• Message number: 003

• Message text: Duplicate field: field &1 already exists in BO &2 and structure &3

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 DMC_MD_XSD003 - Duplicate field: field &1 already exists in BO &2 and structure &3 ?

  The SAP error message DMC_MD_XSD003 indicates that there is a duplicate field in a Business Object (BO) or structure within the Data Migration Cockpit (DMC) or related data modeling tools. This error typically arises when you are trying to define or import a data structure that contains fields with the same name, which is not allowed.
  Cause:
  
  Duplicate Field Names: The most common cause of this error is that the same field name has been defined more than once in the same Business Object or structure.
  Importing Data Models: If you are importing data models or structures from external sources, there may be conflicts due to naming conventions or errors in the source data.
  Manual Configuration Errors: If you are manually configuring the Business Object or structure, it is possible to accidentally create duplicate fields.
  
  Solution:
  
  Check Field Definitions: Review the field definitions in the Business Object or structure mentioned in the error message. Ensure that each field has a unique name.
  Rename Duplicate Fields: If you find duplicate fields, rename them to ensure uniqueness. This may involve changing the field name in the source data or the data model.
  Review Import Files: If you are importing a data model, check the import file for duplicate field definitions and correct them before re-importing.
  Use Unique Naming Conventions: Implement a naming convention that ensures all field names are unique across the Business Object and structures to prevent future occurrences of this error.
  Testing: After making changes, test the configuration or import process again to ensure that the error has been resolved.
  
  Related Information:
  
  Data Migration Cockpit (DMC): This tool is used for data migration in SAP S/4HANA and other SAP systems. Understanding how to configure and manage Business Objects within DMC is crucial for successful data migration.
  Business Object (BO): A Business Object in SAP is a representation of a business entity that contains fields and data relevant to that entity. Each BO should have a well-defined structure without duplicate fields.
  SAP Notes and Documentation: Check SAP Notes and official documentation for any updates or specific guidelines related to the DMC and handling of Business Objects.
  
  If the issue persists after following these steps, consider reaching out to SAP support or consulting the SAP community for further assistance.