Message type: E = Error
Message class:  CNV_NCE_BAS - Number conversion engine: messages 
Message number: 187
Message text: Number Range Objects
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The SAP error message CNV_NCE_BAS187 typically relates to issues with number range objects during data migration or conversion processes, particularly in the context of SAP's data migration tools like the SAP S/4HANA Migration Cockpit or the SAP Data Services.
Cause: Number Range Object Not Defined: The error may occur if the number range object required for the migration is not defined in the system. Number Range Interval Issues: There may be issues with the number range intervals, such as overlapping intervals or intervals that are not properly maintained. Authorization Issues: The user executing the migration may not have the necessary authorizations to access or modify the number range objects. Configuration Errors: Incorrect configuration settings in the number range object can lead to this error.
Solution: Check Number Range Object Definition: Go to transaction code SNRO (Number Range Objects) and verify that the number range object in question is defined and active. Ensure that the intervals for the number range
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