Message type: E = Error
Message class:  CNV_CMIS_M - Message class for CMIS Migration 
Message number: 044
Message text: A rule for the entered table and field name already exists
Only one rule can be defined on a single table field. For the entered
table field name, a rule is specified already.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Enter a different table or field name, or delete the rule assignment.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message CNV_CMIS_M044 indicates that there is an attempt to create a rule for a table and field name that already has an existing rule defined in the system. This error typically occurs during data migration or conversion processes, particularly when using the SAP Conversion Tools or the SAP Data Migration Workbench.
Cause: The primary cause of this error is that the system has detected a duplicate entry for the specified table and field combination in the rules configuration. This can happen if: A rule was previously created for the same table and field. There was an attempt to import or create a rule that conflicts with an existing one. There may be a misunderstanding in the naming conventions or identifiers used for the rules.
Solution: To resolve this error, you can take the following steps: Check Existing Rules: Navigate to the relevant configuration area where the rules are defined (e.g., the Data Migration Workbench or the
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