wh6中IF语句中怎么不能这样写REF(AA,1) (文华财经WH8赢智V8.2)

 T:=1130;
AA1:TIME>=T AND REF(TIME,1)<T;
//AA:VALUEWHEN(TIME>=T AND REF(TIME,1)<T,OPEN);
AA:IF((TIME>=T AND REF(TIME,1)<T),IF(TIME>T,REF(OPEN,1),OPEN),REF(AA,1));
涨跌幅:=(C-AA)/AA*100;
涨幅:IF((C-AA)/AA*100>=0,(C-AA)/AA*100,NULL),COLORRED;
跌幅:IF((C-AA)/AA*100<0,(C-AA)/AA*100,NULL),COLORGREEN;
DRAWNUMBER(ISLASTBAR&&涨跌幅>=0,AA,涨跌幅,2,COLORRED);
DRAWNUMBER(ISLASTBAR&&涨跌幅<0,AA,涨跌幅,2,COLORGREEN );

下面这一句在wh6通用版中怎么处理，下面这样写通不过。

AA:IF((TIME>=T AND REF(TIME,1)<T),IF(TIME>T,REF(OPEN,1),OPEN),REF(AA,1));