Message type: E = Error
Message class:  CNV_20100 - Messageclass for chart of account conversion 
Message number: 103
Message text: Report &1: Complex selection characteristics
It may not be possible to automatically convert complex selection
characteristics of report &V1& in the correct way.
Reports should always be checked for logical consistency after the
conversion. This is particularly important if complex selection
characteristics are used.
After the conversion, check report &V1& manually for semantic
correctness.
If you want to convert tables CEFORMF and CESETS independent of org.
units, call the transaction CNV_PARAMS and set the parameter
CNV_20100_CEFORMF_ORGINDEP to X.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message CNV_20100103, which states "Report &1: Complex selection characteristics," typically occurs during data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or similar tools. This error indicates that the selection criteria defined for the data migration are too complex or not supported by the system.
Cause: Complex Selection Criteria: The selection criteria defined in the migration report may involve multiple conditions, joins, or subqueries that exceed the system's processing capabilities. Unsupported Features: Certain features or functions used in the selection criteria may not be supported in the context of the migration process. Data Volume: Large volumes of data being processed with complex filters can lead to performance issues or exceed system limits.
Solution: Simplify Selection Criteria: Review and simplify the selection criteria used in the report. Try to reduce the number of conditions or break down complex queries into simpler ones. Batch Processing: If possible, process the data in smaller
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