Hello Nainesh,
Please check the SUM upgrade Guide :
A.2.13Cleaning Up Terminated Conversions in the DB Conversion Phases
These conversion errors are indicated by the following Software Update Manager error messages: ■Restart logs of DB conversions found ■Outstanding DB conversions found
These errors can occur in the phases CNV_CHK_GEN, CNV_CHK_IMP and CNV_CHK_XT.
You will find the complete details there.
Best Regards,
Gaurav