In your case it is an AND operator.
in your case user should be
1. Administrator AND
2. current user's owner (whoever created the user) should be owner of the object AND
2. current user should be the owner of the object
So the last two one interfere with each other, so you may not see any result.
hi Teetach Koomkaimuk,
it will take it as OR by default .To make it has and condition use and keyword
By default if you don’t specifically mention the keyword ‘OR’ Mendix will consider it as ‘AND’ conditions.