How To Fix CNVA_20400_CHECK036 - A mix of explicit and implicit merges into a cycle was detected.

SAP Error Message - Details

• Message type: E = Error

• Message class: CNVA_20400_CHECK - Messages for contorlling areas checks

• Message number: 036

• Message text: A mix of explicit and implicit merges into a cycle was detected.

A mix of explicit and implicit merges into a cycle was detected. This
happens when cycles will be merged, but the mapping only containa a part
of the source cycles. Cycles cannot be merged. You must specify
different mapping values.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNVA_20400_CHECK036 - A mix of explicit and implicit merges into a cycle was detected. ?

  The SAP error message CNVA_20400_CHECK036 indicates that there is a problem with the way merges are being handled in a data transformation process, specifically in the context of SAP Data Services or SAP BW (Business Warehouse). This error typically arises when there is a mix of explicit and implicit merges that create a cycle in the data flow.
  Cause:
  
  Explicit Merges: These are merges that are defined directly by the user in the data flow. They are typically used to combine data from different sources or transformations.
  Implicit Merges: These occur automatically when data flows are combined without a direct merge operation being defined by the user.
  Cycle Detection: The error suggests that the combination of explicit and implicit merges has created a circular reference in the data flow. This means that the data is being processed in a way that it could potentially lead to infinite loops or recursive processing, which is not allowed.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Review Data Flow: Examine the data flow in your transformation process. Look for any explicit merges that may be combined with implicit merges in a way that creates a cycle.
  
  
  Eliminate Cycles: Ensure that there are no circular references in your data flow. You may need to redesign the flow to avoid merging paths that lead back to the same source.
  
  
  Use Consistent Merge Types: Decide whether to use explicit or implicit merges consistently throughout your data flow. Mixing the two can lead to confusion and errors.
  
  
  Check for Dependencies: Look for any dependencies between different data sources or transformations that may be causing the cycle. Adjust the order of operations or the way data is merged to eliminate these dependencies.
  
  
  Test Changes: After making adjustments, test the data flow to ensure that the error no longer occurs and that the data is being processed correctly.
  
  
  Related Information:
  
  Documentation: Refer to SAP's official documentation for Data Services or BW for more detailed information on data flows, merges, and best practices.
  Community Forums: Check SAP community forums or support channels for similar issues and solutions shared by other users.
  SAP Notes: Look for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  
  By following these steps, you should be able to identify and resolve the cause of the CNVA_20400_CHECK036 error in your SAP environment.