lingo模型定义不正确 求帮忙!

lingo模型定义不正确 求帮忙!MIN = @SUM( LINKS(I, J): COST(I, J) * VOLUME(I, J))+@SUM(AGENCY(I)|DEMAND(I)#GT#(CAPACITY(I)-@SUM(AGENCY(J):VOLUME(I,J))+@SUM(AGENCY(J):VOLUME(J,I))):DEMAND(I)-(CAPACITY(I)-@SUM(AGENCY(J):VOLUME(I,J))+@SUM(AGENCY(J):VOLUME(J,I))))*LOST(I);错误应该是这一句SETS: AGENCY/Wh1..Wh20/: CAPACITY,DEMAND,LOST; LINKS( AGENCY, AGENCY): COST, VOLUME; ENDSETS 求帮忙看下是什么问题测验后发现是@SUM(AGENCY(I)|(DEMAND(I)-(CAPACITY(I)-@SUM(AGENCY(J):VOLUME(I,J))+@SUM(AGENCY(J):VOLUME(J,I)))#GT#0:(DEMAND(I)-(CAPACITY(I)-@SUM(AGENCY(J):VOLUME(I,J))+@SUM(AGENCY(J):VOLUME(J,I)))*LOST(I));中的条件不对 好像不能带有变量?是这样吗