How To Fix CNV_MBT881 - Double entry. Enter a different number (no.).

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_MBT - PCL message class

• Message number: 881

• Message text: Double entry. Enter a different number (no.).

What causes this issue?

The program has detected entries with the same values in the columns
'Global Parameter Name', 'Client' and 'No.'. If you want to create a
Global Parameter with different values create an entry for each
different value and count the entries in the column 'No.'.

System Response

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

How to fix this error?

To remove the error enumerate the same Global Parameters in the field
'No.'.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_MBT881 - Double entry. Enter a different number (no.). ?

  The SAP error message CNV_MBT881 ("Double entry. Enter a different number (no.)") typically occurs during data migration or data transfer processes, particularly when using the SAP Migration Tool or during the execution of a migration project. This error indicates that there is a duplicate entry in the data being processed, which violates the uniqueness constraint of the field in question.
  Cause:
  
  Duplicate Data: The most common cause of this error is that the data being imported or migrated contains duplicate entries for a field that requires unique values (e.g., primary keys, document numbers).
  Incorrect Mapping: If the mapping of fields from the source system to the target system is incorrect, it may lead to duplicates being created.
  Data Preparation Issues: The data preparation phase may not have adequately handled duplicates, leading to multiple entries for the same identifier.
  
  Solution:
  
  Identify Duplicates: Review the data being imported to identify any duplicate entries. This can often be done using data analysis tools or SQL queries to check for duplicates in the relevant fields.
  Data Cleansing: Remove or consolidate duplicate entries in the source data before attempting the migration again. Ensure that each entry is unique as required by the target system.
  Adjust Mapping: If the error is due to incorrect mapping, review and adjust the mapping configuration to ensure that it aligns correctly with the target system's requirements.
  Use Unique Identifiers: If applicable, ensure that unique identifiers are generated or assigned to each entry in the source data to prevent duplicates.
  Test Migration: Before performing a full migration, conduct a test migration with a smaller dataset to ensure that the issue has been resolved.
  
  Related Information:
  
  Transaction Codes: Depending on the context, you may be using transaction codes like LSMW (Legacy System Migration Workbench) or other data migration tools.
  SAP Notes: Check SAP Notes for any specific guidance or patches related to the error message CNV_MBT881.
  Documentation: Review the documentation for the migration tool you are using, as it may provide additional insights into handling duplicates and other common issues.
  
  By addressing the root cause of the duplicate entries and ensuring that your data is clean and correctly mapped, you should be able to resolve the CNV_MBT881 error and proceed with your migration successfully.