@abc.abstractmethod<EOL><INDENT>def overrides_calculated_entry(self):<DEDENT>
return<EOL>
Tests if this is a manual entry that overrides a calculated entry.

        :return: ``true`` if this entry overrides a calculated entry, ``false`` otherwise. If ``true,`` then ``is_derived()`` must be ``false``.
        :rtype: ``boolean``


        *compliance: mandatory -- This method must be implemented.*