How To Fix DMC_RT_MSG544 - Complex type node with identifier &1 appears more than once

SAP Error Message - Details

• Message type: E = Error

• Message class: DMC_RT_MSG - DMC: Runtime Object Messages

• Message number: 544

• Message text: Complex type node with identifier &1 appears more than once

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DMC_RT_MSG544 - Complex type node with identifier &1 appears more than once ?

  The SAP error message DMC_RT_MSG544 indicates that there is a problem with the data structure being processed, specifically that a complex type node with a given identifier appears more than once in the context where it is expected to be unique. This typically occurs in scenarios involving data migration or data replication, particularly when using SAP Data Migration Cockpit (DMC) or similar tools.
  Cause:
  
  Duplicate Entries: The most common cause of this error is that the data being imported or processed contains duplicate entries for a complex type node. This could happen if the source data has multiple records that are supposed to map to a single target record.
  Incorrect Mapping: There may be an issue with how the data is mapped from the source to the target, leading to multiple instances of the same identifier being generated.
  Data Structure Issues: The data structure defined in the migration or replication process may not align with the actual data being processed, causing conflicts.
  
  Solution:
  
  Check Source Data: Review the source data for duplicates. Ensure that the complex type node with the specified identifier is unique across the dataset.
  Adjust Mapping: If the mapping configuration allows for multiple entries, consider adjusting it to ensure that it correctly reflects the intended data structure. This may involve changing the mapping rules or the way data is aggregated.
  Data Cleansing: If duplicates are found in the source data, perform data cleansing to remove or consolidate duplicate entries before attempting the migration or replication again.
  Review Data Model: Ensure that the data model used in the migration or replication process is correctly defined and that it matches the expected structure of the target system.
  Consult Documentation: Refer to SAP documentation or guides related to the specific migration or replication process you are using for additional insights and best practices.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  Data Migration Cockpit (DMC): Familiarize yourself with the features and limitations of the DMC, as it may have specific requirements for data structure and mapping.
  Testing: Before executing large migrations, conduct tests with smaller datasets to identify potential issues early in the process.
  Support: If the issue persists after attempting the above solutions, consider reaching out to SAP support for further assistance.
  
  By addressing the root cause of the duplicate entries and ensuring proper mapping and data structure, you should be able to resolve the DMC_RT_MSG544 error.