How To Fix CNV_NCE_BAS253 - Row &1: conversion rule is ambiguous

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_NCE_BAS - Number conversion engine: messages

• Message number: 253

• Message text: Row &1: conversion rule is ambiguous

What causes this issue?

The file you uploaded contains ambiguous definition of conversion rules
for number range object in row &V1&.
You can only define one of the given options: 'Offset', 'Pattern' or
'External function' for a given number range row object.
The row &V1&, however, contains definitions for more than one conversion
rule type.

System Response

An error message is issued.
Uploaded mapping will not be used.

How to fix this error?

Correct the file and upload it again.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_NCE_BAS253 - Row &1: conversion rule is ambiguous ?

  The SAP error message CNV_NCE_BAS253 with the description "Row &1: conversion rule is ambiguous" typically occurs during data conversion processes, particularly when using the SAP Data Migration tools or during the execution of a conversion program. This error indicates that the system has encountered a situation where it cannot determine a clear conversion rule for a specific row of data.
  Cause:
  The ambiguity in conversion rules can arise from several factors, including:
  
  Multiple Matching Rules: There may be multiple conversion rules that could apply to the same data, leading to confusion about which rule to use.
  Incomplete or Incorrect Configuration: The configuration of the conversion rules may be incomplete or incorrectly set up, causing the system to be unable to resolve which rule to apply.
  Data Quality Issues: The data being processed may have inconsistencies or errors that prevent the system from applying a clear conversion rule.
  Missing Data: Required fields or values that are necessary for determining the conversion rule may be missing.
  
  Solution:
  To resolve the CNV_NCE_BAS253 error, you can take the following steps:
  
  Review Conversion Rules: Check the conversion rules defined in the system. Ensure that there are no overlapping or conflicting rules that could lead to ambiguity.
  Data Validation: Validate the data in the row that is causing the error. Look for any inconsistencies, missing values, or formatting issues that could affect the conversion.
  Modify Rules: If necessary, modify the conversion rules to make them more specific or to eliminate any overlaps. This may involve adding conditions or refining the logic used in the rules.
  Test with Sample Data: Before running the full conversion, test the conversion process with a smaller set of data to ensure that the rules are working as expected.
  Consult Documentation: Refer to SAP documentation or guides related to the specific data migration tool or process you are using for additional insights and best practices.
  Seek Support: If the issue persists, consider reaching out to SAP support or consulting with a technical expert who has experience with data migration and conversion processes in SAP.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance on data conversion issues.
  Data Migration Tools: Familiarize yourself with the specific data migration tools being used (e.g., SAP S/4HANA Migration Cockpit, SAP Data Services) and their documentation for best practices.
  Community Forums: Engage with SAP community forums or user groups where similar issues may have been discussed, and solutions shared.
  
  By following these steps, you should be able to identify the cause of the ambiguity and implement a solution to resolve the error.