ALTER TABLE tm_testing_session ALTER COLUMN allow_one_company_play_several_role_in_group_tests DROP NOT NULL;
ALTER TABLE tm_testing_session ALTER COLUMN allow_one_company_play_several_role_in_p2p_tests DROP NOT NULL;
ALTER TABLE tm_testing_session ALTER COLUMN allow_participants_start_group_tests DROP NOT NULL;
ALTER TABLE tm_testing_session ALTER COLUMN systemautoacceptance DROP NOT NULL;
