add master and delete

hello MDM experts,

i have a problem deleting a record which i added through mdm data manager.. i right-clicked and chose add master, then i checked it out and then made a duplicate of the record. i did all these to see what happens, what i can do and what i can not, but as far as i saw, i can't delete those records, they still stay on the panel. is there any way to delete those records from mdm data manager??

answers appreciated,

thanks..