3072123 - Transfer of data to staging table failed with error "instance already exists in the table" in Migrate Your Data app

Transfer of data to staging table failed and error message "Cannot insert XXX into table /1LT/XXX (<SAP Structure>); instance already exists in the table" is displayed in the app Migrate Your Data.

SAP S/4HANA Cloud Public Edition

There is an existing record with the same key fields in the staging table.

1. Identify the record in the staging table that faces the mentioned error.
2. Remove the old file and delete the corresponding instances from the staging table. 
3. Upload the new template file again and transfer the data again to the staging table.

KBA 3004732 - Cannot insert XXXXXXXXXXX into table /XXX/XXXXXXX (S_SUPPL_COMPANY); instance already exists in the table 

Duplicated, instance, Staging Tables, duplicated entry, duplicated entries, duplicate entry, duplicate entries, delete, update , KBA , CA-LT-MC , S/4HANA Migration Cockpit , CA-GTF-MIG , SAP S/4HANA Data Migration Cockpit Content , Problem