Message type: E = Error
Message class:  CNV_PE_MC - Messages for Migration Cockpit context 
Message number: 012
Message text: No migration object instances for scheduling available
Activity scheduling failed.
No migration object instances for scheduling found.
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 CNV_PE_MC012 indicates that there are no migration object instances available for scheduling in the context of a data migration project, typically when using the SAP S/4HANA Migration Cockpit or similar tools. This error can occur during the migration process when the system is unable to find any instances of the migration object that you are trying to work with. Causes: No Data Available: The most common cause is that there are no records in the source system that match the criteria for the migration object you are trying to schedule. Incorrect Selection Criteria: The selection criteria defined for the migration object may be too restrictive, resulting in no instances being found. Migration Object Not Activated: The migration object may not be activated or properly configured in the system. Technical Issues: There could be technical issues or inconsistencies in the migration setup or configuration. Solutions: Check Data Availability: Verify that there is data in
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