How To Fix CNV_10020477 - &1: Length &3 of source 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: 477

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

What causes this issue?

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

How to fix this error?

Define a smaller source 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_10020477 - &1: Length &3 of source det. object &2 is greater than maximum length &4 ?

  The SAP error message CNV_10020477 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 source data object exceeds the maximum allowable length defined in the target structure.
  Cause:
  The error message can be broken down as follows:
  
  Source Data Object: This refers to the data being migrated or converted.
  Length: The actual length of the source data object.
  Maximum Length: The maximum length defined in the target structure for that particular field.
  
  The error occurs when the data being processed is too long for the target field, which can happen due to:
  
  Incorrect mapping of fields between source and target.
  Changes in data structure or field definitions between the source and target systems.
  Data quality issues in the source system, such as unexpected long strings.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Field Mapping: Review the mapping between the source and target fields to ensure that the lengths are compatible. Make sure that the target field can accommodate the data being migrated.
  
  
  Adjust Target Field Length: If possible, increase the length of the target field in the target structure to accommodate the source data. This may involve modifying the data model in the target system.
  
  
  Data Cleansing: If the source data contains unexpected long strings, consider cleansing the data before migration. This could involve truncating, splitting, or otherwise modifying the data to fit the target structure.
  
  
  Review Data Types: Ensure that the data types of the source and target fields are compatible. Sometimes, a mismatch in data types can lead to length issues.
  
  
  Consult Documentation: Refer to the SAP documentation or notes related to the specific migration or conversion tool you are using. There may be specific guidelines or best practices for handling such errors.
  
  
  Testing: After making adjustments, perform a test migration to ensure that the changes resolve the issue without introducing new errors.
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may provide additional context or solutions for this specific error message.
  Data Migration Tools: Familiarize yourself with the specific data migration tools being used (e.g., SAP S/4HANA Migration Cockpit, LSMW, etc.) as they may have specific configurations or settings that can help mitigate such issues.
  Error Logs: Review error logs or detailed migration logs to identify specific records causing the issue, which can help in troubleshooting.
  
  By following these steps, you should be able to identify the root cause of the error and implement a suitable solution.