Message type: E = Error
Message class:  CNV_NCE_BAS - Number conversion engine: messages 
Message number: 457
Message text: Target subobject is invalid
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The SAP error message CNV_NCE_BAS457: Target subobject is invalid 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 target subobject specified in the migration or conversion process is not recognized or is invalid. Causes: Incorrect Configuration: The target subobject may not be correctly configured in the system or may not exist in the target environment. Data Mapping Issues: There may be a mismatch between the source and target data structures, leading to an invalid reference to a subobject. Missing Customization: If the target system has custom objects or fields that are not properly defined, this can lead to the error. Version Compatibility: The version of the migration tool or the source/target systems may not be compatible, leading to issues in recognizing subobjects. Solutions: Check Configuration: Verify that the target subobject is correctly defined in the target system. Ensure
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