How To Fix CNV_NCE_BAS254 - Row &1: conversion rule is not defined

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_NCE_BAS - Number conversion engine: messages

• Message number: 254

• Message text: Row &1: conversion rule is not defined

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_NCE_BAS254 - Row &1: conversion rule is not defined ?

  The SAP error message CNV_NCE_BAS254 indicates that there is a missing conversion rule for a specific row in a data conversion process. This error typically occurs during data migration or conversion activities, particularly when using SAP's data migration tools or the SAP S/4HANA Migration Cockpit.
  Cause:
  The error arises when the system encounters a row of data that requires a conversion rule to transform the data from the source format to the target format, but no such rule has been defined. This can happen due to several reasons:
  
  Missing Configuration: The conversion rules for the specific data type or field have not been set up in the migration tool.
  Incorrect Mapping: The mapping between the source and target data structures is incomplete or incorrect.
  Data Quality Issues: The data in the source system may not conform to the expected format, leading to the absence of a defined conversion rule.
  
  Solution:
  To resolve the error, you can take the following steps:
  
  
  Check Conversion Rules:
  
  Go to the relevant transaction or tool where the conversion rules are defined (e.g., SAP LT (Landscape Transformation) or the Migration Cockpit).
  Verify if the conversion rules for the specific field or data type are defined. If not, create the necessary conversion rules.
  
  
  
  Review Mapping:
  
  Ensure that the mapping between the source and target structures is correctly defined. Check if all required fields have corresponding mappings.
  
  
  
  Data Validation:
  
  Validate the data in the source system to ensure it meets the expected format and standards. Cleanse the data if necessary to avoid issues during conversion.
  
  
  
  Consult Documentation:
  
  Refer to the SAP documentation or guides related to the specific migration tool you are using. This may provide insights into how to define conversion rules and troubleshoot common issues.
  
  
  
  Testing:
  
  After making the necessary adjustments, re-run the data migration process to see if the error persists. It may be helpful to test with a smaller dataset first.
  
  
  
  Seek Support:
  
  If the issue continues, consider reaching out to SAP support or consulting with an SAP expert who has experience with data migration processes.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance on data migration and conversion rules.
  Migration Cockpit: Familiarize yourself with the SAP S/4HANA Migration Cockpit, as it provides tools and templates for data migration, including how to define conversion rules.
  Data Migration Best Practices: Review best practices for data migration in SAP environments to ensure a smooth transition and minimize errors.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.