Message type: E = Error
Message class:  CNV_20345_CHECK - Message Class for 20345 Checks 
Message number: 026
Message text: No mapping provided
Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.
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The SAP error message CNV_20345_CHECK026: No mapping provided typically occurs during data migration or conversion processes, particularly when using SAP's data migration tools like the SAP S/4HANA Migration Cockpit or other conversion tools. This error indicates that there is a missing mapping for a specific field or data element that is required for the migration process.
Cause: Missing Mapping Configuration: The most common cause of this error is that the mapping for a specific field in the source system to the target system has not been defined. This can happen if the migration template or mapping configuration is incomplete. Incorrect Data Structure: The data structure in the source system may not match the expected structure in the target system, leading to missing mappings. Custom Fields: If there are custom fields in the source system that do not have corresponding fields in the target system, this can also trigger the error. Inconsistent Data: If the data
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