Shalom Ilja,
you should go to database maintenance, DXCC/Prefix maintenance, select KC4\A Antarctica - in the opening window click to the dropdown-list in the row Alternative Prefixes, scroll down - there is an entry VP8PJ which you have to delete (cklick on VP8PJ and click to the button "Delete").
Then go back to the country database mainenance window, select VP8\O. Click on it and in the upcoming window go to the dropdown list "Alternative Prefixes", write VP8PJ into it and press the "Add" button. Close all windows and insert VP8PJ into th log window. Now it should show you VP8PJ as VP8\O.

Good luck and 73 - Gerd / DL7VOG

Hope to cu in Friedrichshafen in a few weeks.