How To Fix DMCLG528 - Cardinality of receiver structure in '&1 << &2' in '&3' and '&4' differs

SAP Error Message - Details

• Message type: E = Error

• Message class: DMCLG - DMC Tool Development

• Message number: 528

• Message text: Cardinality of receiver structure in '&1 << &2' in '&3' and '&4' differs

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DMCLG528 - Cardinality of receiver structure in '&1 << &2' in '&3' and '&4' differs ?

  The SAP error message DMCLG528 indicates a cardinality mismatch between the receiver structure and the source structure in a data transfer process. This typically occurs in scenarios involving data modeling, such as when using SAP Data Services or SAP BW (Business Warehouse).
  Cause:
  The error arises when the cardinality (the number of instances of one entity that can or must be associated with each instance of another entity) of the receiver structure does not match the cardinality of the source structure. This can happen due to:
  
  
  Inconsistent Data Model: The data model defined for the source and target structures may not align. For example, if the source structure allows multiple records (1:N relationship) but the target structure expects a single record (1:1 relationship), this error will occur.
  
  
  Mapping Issues: There may be incorrect mappings defined in the transformation rules between the source and target structures.
  
  
  Changes in Data Model: If there have been recent changes to the data model (e.g., adding or removing fields, changing relationships), it can lead to mismatches.
  
  
  Solution:
  To resolve the DMCLG528 error, you can follow these steps:
  
  
  Review Data Models: Check the data models for both the source and target structures. Ensure that the cardinality is correctly defined and matches the expected relationships.
  
  
  Adjust Mappings: Verify the mappings in the transformation rules. Ensure that the mappings correctly reflect the intended relationships and cardinalities.
  
  
  Modify Target Structure: If necessary, adjust the target structure to accommodate the cardinality of the source structure. This may involve changing the target structure to allow for multiple records if the source structure is designed to provide them.
  
  
  Test Data Flow: After making adjustments, test the data flow again to ensure that the error is resolved.
  
  
  Consult Documentation: Refer to SAP documentation or community forums for specific guidance related to your version of SAP and the context in which the error occurs.
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  Data Services Documentation: Review the SAP Data Services documentation for best practices on data modeling and transformation rules.
  Community Forums: Engage with SAP community forums or support channels for insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to identify the cause of the DMCLG528 error and implement a solution to resolve it.