Message type: E = Error
Message class:  CNV20330 - Message for package 20330 (object numbers) 
Message number: 018
Message text: No generated conversion program for table ONRAO found
No generated converion program found for table ONRAO.
According to the entries in CNVTABLES, the table ONRAO gets converted.
The phase 'Generation' would have to be completed successfully.
Es fehlt der entsprechende CNVSTATE-Eintrag fnr Tabelle ONRAO in der
Phase 'Conversion'.
Error
Execute the activities in the phase 'Generation' first.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message CNV20330018 indicates that there is no generated conversion program for the specified table, in this case, ONRAO. This error typically occurs during data migration or conversion processes, particularly when using SAP's Data Migration tools or the SAP S/4HANA Migration Cockpit.
Cause: Missing Conversion Program: The primary cause of this error is that the conversion program for the specified table has not been generated. This can happen if the necessary steps to create the conversion program were not executed or if there was an issue during the generation process. Incorrect Configuration: There may be a misconfiguration in the migration settings or the mapping of the data that prevents the generation of the conversion program. Table Not Supported: The table in question may not be supported for conversion in the current context or version of the migration tool being used.
Solution: Generate the Conversion Program: Check the migration project settings and ensure that the table
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV20330017 Table ONRAO is not converted
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV20330016 CNVFIPARS-PARAMTYPE=&1 is not supported
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV20330019 Conversion program &1 for table ONRAO has already run
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV20330020 In phase &1, program &2 has not yet been executed without errors
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
Click on this link to search all SAP messages.