How To Fix CNV_MBT520 - &1:Fieldname &2 of structure &3 mentioned in selref not found in sender

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_MBT - PCL message class

• Message number: 520

• Message text: &1:Fieldname &2 of structure &3 mentioned in selref not found in sender

The selection field mentioned for the reduction of this conversion
object does not exist in the sender system. Thus this selection field
can notbe used for reduction. Please remove the assignment of this
conversion object from reduction. For further assistance please contact
SAP support.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_MBT520 - &1:Fieldname &2 of structure &3 mentioned in selref not found in sender ?

  The SAP error message CNV_MBT520 typically occurs during data migration processes, particularly when using the SAP Migration Tool (or similar tools) to transfer data from one system to another. This error indicates that a specific field in the data structure is not found in the sender system, which can lead to issues during the migration process.
  Cause:
  The error message CNV_MBT520 is triggered due to one or more of the following reasons:
  
  
  Field Mismatch: The field specified in the error message does not exist in the source structure (sender) that is being referenced. This could be due to a typo, a change in the data model, or an incorrect mapping.
  
  
  Data Structure Changes: If the data structure in the sender system has been modified (e.g., fields added, removed, or renamed) after the migration mapping was created, it can lead to this error.
  
  
  Incorrect Configuration: The configuration settings for the migration might not be set up correctly, leading to references to non-existent fields.
  
  
  Version Differences: If there are version differences between the source and target systems, certain fields may not be available in the sender system.
  
  
  Solution:
  To resolve the CNV_MBT520 error, you can follow these steps:
  
  
  Verify Field Existence: Check the sender system to ensure that the field mentioned in the error message actually exists in the specified structure. You can do this by looking at the data dictionary (SE11) or the relevant table/structure.
  
  
  Update Mapping: If the field does not exist, you may need to update the mapping in the migration tool to either remove the reference to the non-existent field or map it to an existing field.
  
  
  Check for Changes: Review any recent changes made to the data model in the sender system. If fields were renamed or removed, update the migration mapping accordingly.
  
  
  Consult Documentation: Refer to the migration documentation or guides provided by SAP for the specific migration scenario you are working on. This can provide insights into required fields and structures.
  
  
  Testing: After making the necessary adjustments, perform a test migration to ensure that the error is resolved and that data is being migrated correctly.
  
  
  Seek Support: If the issue persists, consider reaching out to SAP support or consulting with a technical expert who specializes in SAP migrations.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SE11 (Data Dictionary), SE80 (Object Navigator), and others that may help in analyzing the data structures.
  SAP Notes: Check for any SAP Notes related to the migration tool or the specific error message for additional guidance or patches.
  Migration Tools: Understand the specific migration tool you are using (e.g., SAP S/4HANA Migration Cockpit, SAP Data Services) as they may have unique configurations and requirements.
  
  By following these steps, you should be able to identify the root cause of the error and implement a solution to resolve it.