How To Fix CNV_20340_CHECK001 - Explicit cycle merge found

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_20340_CHECK - Message Class for 20340 Checks

• Message number: 001

• Message text: Explicit cycle merge found

What causes this issue?

An explicit merge of cycles was detected. This occurs when a mapping is
provided, that states that different cycles are renamed to the same
name.
A merge of cycles is not supported. To resolve this issue, you have to
change the mapping values for the cycles.
You cannot run the transformation solution Controlling Area Merge
because certain prerequisites have not been met. Please change your
mapping accordingly.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_20340_CHECK001 - Explicit cycle merge found ?

  The SAP error message CNV_20340_CHECK001 with the description "Explicit cycle merge found" typically occurs during data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or other data migration tools. This error indicates that there is a cycle in the data relationships that the system cannot resolve, which can lead to inconsistencies or infinite loops during the data processing.
  Cause:
  The error is usually caused by:
  
  Cyclic Dependencies: There are circular references in the data being migrated. For example, if you have entities that reference each other in a loop, the migration tool cannot determine the correct order to process them.
  Incorrect Data Relationships: The data model may have been designed or populated in a way that creates cycles, such as parent-child relationships that loop back on themselves.
  Configuration Issues: The migration settings or mappings may not be correctly defined, leading to unintended cycles.
  
  Solution:
  To resolve the CNV_20340_CHECK001 error, you can take the following steps:
  
  
  Analyze Data Relationships:
  
  Review the data model and relationships between entities to identify any cycles. Use tools or queries to visualize the relationships and spot any circular references.
  
  
  
  Modify Data Structure:
  
  If you find cyclic dependencies, consider restructuring the data to eliminate these cycles. This may involve changing how entities reference each other or breaking the cycle by introducing intermediate entities.
  
  
  
  Adjust Migration Mapping:
  
  Check the migration mapping configuration to ensure that it correctly reflects the intended relationships without creating cycles. Adjust the mapping as necessary.
  
  
  
  Use Staging Tables:
  
  If applicable, consider using staging tables to temporarily hold data during the migration process. This can help break cycles by allowing you to load data in a controlled manner.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or notes related to the specific migration tool you are using. There may be specific guidelines or best practices for handling cyclic dependencies.
  
  
  
  Testing:
  
  After making changes, perform a test migration to ensure that the error is resolved and that the data is being processed correctly.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or solutions for this specific error.
  Migration Cockpit Documentation: Review the official SAP documentation for the Migration Cockpit or the specific tool you are using for data migration.
  Community Forums: Engage with the SAP community forums or support channels to see if others have encountered and resolved similar issues.
  
  By following these steps, you should be able to identify and resolve the cause of the CNV_20340_CHECK001 error during your data migration process.