EXECUTE
               'CREATE OR REPLACE RULE блаблабла
               'WHERE NEW.game_code_fk = ''' || p_game_code || ''' \n' ||
               '  AND NEW.gtrx_type = '''||v_dbtcrdt_char||''' \n' ||
               'DO INSTEAD \n' ||
               'блабла';

...  WHERE new.game_code_fk::text = 'xx'::text AND new.gtrx_type = 'A'::bpchar DO INSTEAD ...

...  WHERE new.game_code_fk = 'xx'::varchar AND new.gtrx_type = 'A'::bpchar DO INSTEAD ...

NEW.game_code_fk = ''' || p_game_code || '''::VARCHAR \n' ||

...  WHERE new.game_code_fk::text = 'xx'::character varying::text AND new.gtrx_type = 'A'::bpchar DO INSTEAD ...