How To Fix CNV_PE791 - Parameter &1 cannot be used for access path index (wrong type or length)

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_PE - General messages for posting engine

• Message number: 791

• Message text: Parameter &1 cannot be used for access path index (wrong type or length)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_PE791 - Parameter &1 cannot be used for access path index (wrong type or length) ?

  The SAP error message CNV_PE791 indicates that there is an issue with a parameter being used for an access path index in a conversion or migration process. This error typically arises when the parameter specified does not match the expected type or length required for the access path index.
  Cause:
  
  Incorrect Data Type: The parameter being used may not be of the correct data type. For example, if the access path index expects a numeric type but receives a character type, this error can occur.
  Length Mismatch: The length of the parameter may not match the expected length defined in the database schema or the access path index. For instance, if the index expects a string of length 10 but receives a string of length 5, this error will be triggered.
  Configuration Issues: There may be misconfigurations in the migration or conversion settings that lead to the use of incorrect parameters.
  
  Solution:
  
  Check Parameter Definition: Review the definition of the parameter that is causing the error. Ensure that it matches the expected data type and length as defined in the database schema or the access path index.
  Adjust Data Types: If the parameter is of the wrong type, modify the data type in the relevant configuration or mapping to ensure it aligns with the expected type.
  Modify Length: If the length of the parameter is incorrect, adjust it to match the expected length. This may involve truncating or padding the data as necessary.
  Review Migration Settings: Check the migration or conversion settings to ensure that all parameters are correctly configured and that there are no discrepancies in the mapping.
  Consult Documentation: Refer to SAP documentation or notes related to the specific migration or conversion process you are working on. There may be specific guidelines or known issues that can provide further insight.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  Transaction Codes: Use transaction codes like SE11 (Data Dictionary) to inspect the table definitions and ensure that the parameters align with the expected types and lengths.
  Logs and Traces: Review logs and traces generated during the migration or conversion process for additional context on the error.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  
  By following these steps, you should be able to identify the root cause of the CNV_PE791 error and implement the necessary corrections to resolve it.