How To Fix CNV_10020478 - &1: Length &3 of target det. object &2 is greater than maximum length &4

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_10020 - Message class for package 10020

• Message number: 478

• Message text: &1: Length &3 of target det. object &2 is greater than maximum length &4

What causes this issue?

The length of target determination object &V2& was specified as &V3&.
However the allowed maximum length of a target determination object is
&V4&. Target determination object values of larger size cannot be stored
in an object table.

How to fix this error?

Define a smaller target determination object for &V1&.
&HINTS&
The maximum length can be defined differently for source and target
determination objects.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_10020478 - &1: Length &3 of target det. object &2 is greater than maximum length &4 ?

  The SAP error message CNV_10020478 typically occurs during data migration or conversion processes, particularly when using SAP's Data Migration tools or during the execution of a conversion program. This error indicates that the length of a target data object exceeds the maximum allowed length defined in the target structure.
  Cause:
  The error message can be triggered by several factors:
  
  Data Length Mismatch: The source data being migrated has a length that exceeds the defined maximum length of the target field in the database or data structure.
  Incorrect Mapping: The mapping between source and target fields may not be correctly defined, leading to an attempt to insert data that is too long for the target field.
  Data Quality Issues: The source data may contain unexpected characters or formatting that increases its length beyond what is expected.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Field Lengths: Review the definitions of the source and target fields. Ensure that the target field can accommodate the data being migrated. If necessary, adjust the target field length in the database or data structure.
  
  
  Data Truncation: If the target field cannot be expanded, consider truncating the source data to fit within the maximum length of the target field. This can be done through data transformation rules in the migration tool.
  
  
  Mapping Review: Verify the mapping configuration between the source and target fields. Ensure that the correct fields are being mapped and that their lengths are compatible.
  
  
  Data Cleansing: Perform data cleansing on the source data to remove any unnecessary characters or formatting that may be causing the length to exceed the limit.
  
  
  Error Logging: Check the logs generated during the migration process for more detailed information about which specific records are causing the error. This can help in identifying patterns or specific issues with the data.
  
  
  Testing: After making adjustments, run a test migration with a smaller dataset to ensure that the changes resolve the issue before proceeding with the full migration.
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to data migration and the specific error message for any additional guidance or patches that may be available.
  Data Migration Tools: Familiarize yourself with the specific data migration tools being used (e.g., SAP S/4HANA Migration Cockpit, SAP Data Services) as they may have specific configurations or settings that can help mitigate such issues.
  Documentation: Review the documentation for the data migration process to ensure compliance with best practices and guidelines.
  
  By following these steps, you should be able to identify the root cause of the error and implement a suitable solution.