How To Fix CNV_DMC_MC_EXCEPTION014 - New row needed for access type READ TABLE or mapping type 'Aggregation'

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_DMC_MC_EXCEPTION - Exception texts of Migration Object Modeller

• Message number: 014

• Message text: New row needed for access type READ TABLE or mapping type 'Aggregation'

What causes this issue?

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

System Response

How to fix this error?

In order to use the access type ?READ TABLE? or the mapping type
?Aggregation?, add a row that has the access type ?LOOP AT TABLE? or
?Mapping Only? and the mapping type ?1:1 Relation? or ?Split?.

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_DMC_MC_EXCEPTION014 - New row needed for access type READ TABLE or mapping type 'Aggregation' ?

  The SAP error message CNV_DMC_MC_EXCEPTION014 typically occurs during data migration processes, particularly when using the SAP Data Migration Cockpit (DMC) or similar tools. This error indicates that there is an issue with the data mapping or the way data is being accessed during the migration process.
  Cause:
  
  
  Missing Mapping Configuration: The error often arises when there is no appropriate mapping defined for the data being processed. This can happen if the source data does not match the expected structure or if the mapping rules are incomplete.
  
  
  Access Type Issues: The error message specifically mentions "access type READ TABLE," which suggests that the system is trying to read data from a table but cannot find the necessary configuration or data to do so.
  
  
  Aggregation Issues: If the mapping type is set to 'Aggregation', it may indicate that the system is expecting to aggregate data from multiple rows but cannot find the necessary rows to perform this operation.
  
  
  Solution:
  
  
  Check Mapping Configuration: Review the mapping configuration in the DMC. Ensure that all necessary fields are correctly mapped from the source to the target. If any fields are missing or incorrectly configured, update the mapping accordingly.
  
  
  Validate Source Data: Ensure that the source data being migrated is complete and adheres to the expected structure. Check for any missing rows or fields that may be causing the issue.
  
  
  Adjust Access Types: If applicable, review the access types defined in the migration project. Ensure that the access types are correctly set up to read the necessary data from the source tables.
  
  
  Aggregation Settings: If the mapping type is set to 'Aggregation', verify that the aggregation logic is correctly defined and that the necessary data is available for aggregation. You may need to adjust the logic or ensure that the required data is present.
  
  
  Consult Documentation: Refer to the SAP documentation for the Data Migration Cockpit or the specific migration tool you are using. There may be additional guidelines or troubleshooting steps provided for this error.
  
  
  Logs and Traces: Check the logs and traces generated during the migration process for more detailed error messages or warnings that can provide further insights into the issue.
  
  
  Related Information:
  
  SAP Notes: Search for relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  Training and Documentation: Consider reviewing training materials or documentation related to the SAP Data Migration Cockpit to better understand the mapping and data access processes.
  
  By following these steps, you should be able to identify the root cause of the error and implement a solution to resolve it.