def computeFullname(self):
        """ compute the fullname from the firstname and lastname values """
        YearsOfService = self.getField('YearsOfService').getAccessor(self)()
        creator = self.Creator()
        member = self.portal_membership.getMemberById(creator)
        user=member.getProperty('fullname', 'Fullname missing')
        space = ': '
        return "%s%s%s" % (YearsOfService, space,user)