How To Fix USMD_CREQUEST_API031 - Singleton cardinality violated for entity &1

SAP Error Message - Details

• Message type: E = Error

• Message class: USMD_CREQUEST_API - Message Class for Change Request API

• Message number: 031

• Message text: Singleton cardinality violated for entity &1

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message USMD_CREQUEST_API031 - Singleton cardinality violated for entity &1 ?

  The SAP error message USMD_CREQUEST_API031 indicates that there is a violation of singleton cardinality for a specific entity in the context of the SAP Master Data Governance (MDG) application. This typically means that the system expected to find a single instance of a particular entity but found none or more than one.
  Cause:
  
  Data Model Configuration: The error often arises from incorrect configuration in the data model where the cardinality (the number of instances allowed) for an entity is not set correctly.
  Duplicate Entries: There may be duplicate entries in the database for the entity in question, which violates the singleton constraint.
  Incorrect Data Handling: The logic in the application or the data processing might be incorrectly handling the entity, leading to multiple instances being created or expected.
  Inconsistent Data State: The data state might be inconsistent due to previous operations that did not complete successfully, leaving the system in an unexpected state.
  
  Solution:
  
  Check Data Model Configuration: Review the data model configuration for the entity in question. Ensure that the cardinality settings are correct and align with the business requirements.
  Data Cleanup: If there are duplicate entries, you may need to clean up the data. This could involve deleting or merging duplicate records to ensure that only one instance exists.
  Review Application Logic: If you have custom logic or enhancements, review the code to ensure that it correctly handles the entity and adheres to the expected cardinality.
  Consistency Check: Run consistency checks or validation reports in MDG to identify and resolve any inconsistencies in the data.
  Debugging: If the issue persists, consider debugging the application to trace where the violation occurs. This may involve checking the API calls and the data being processed.
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to the error message for any patches or updates that may address the issue.
  MDG Documentation: Review the SAP Master Data Governance documentation for best practices on data modeling and cardinality settings.
  Community Forums: Engage with SAP community forums or support channels to see if others have encountered similar issues and how they resolved them.
  
  If the problem continues after trying the above solutions, it may be beneficial to reach out to SAP support for further assistance.