How To Fix CNV20400212 - Optimization: Exclude fields that are also excluded from the split

CNV20400212 - Overview

• Message type: E = Error

• Message class: CNV20400 - Message class CNV20400

• Message number: 212

• Message text: Optimization: Exclude fields that are also excluded from the split

Optimization: Exclude fields which are also excluded from split
This optimization step checks for all table fields which are converted
in the controlling area merge (current package) if there has also been
a conversion in the controlling area split package before.
If a field has been set explicitly to NOTUSE='X' in the split then this
field will also be excluded from merge. For fields which are not
existing in CNVFIELDS for the split no changes are performed for the
merge.

Error message extract from SAP system. Copyright SAP SE.

CNV20400212 - Details

• The SAP error message CNV20400212 typically occurs during data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or similar tools. This error indicates that there are fields in your data mapping that are being excluded from the migration process, but those same fields are also being excluded from a split operation. This can create a conflict in the data processing logic.
  
  Cause:
  
  Field Exclusion: The error arises when certain fields are marked for exclusion in the migration mapping, but the system is trying to process them in a way that requires those fields to be included (e.g., during a split operation).
  Mapping Configuration: There may be inconsistencies in the mapping configuration where fields are not properly aligned with the intended data transformation rules.
  Data Model Changes: Changes in the data model or structure between the source and target systems can lead to such conflicts, especially if certain fields are no