Originally posted by: raghu1987

Hello All,
I have a opl constrainst which is not working the way it should.

forall(b in BoxData , <l> in CellLenData , <w> in CellWidData , <h> in CellHgtData)
{ sum(bt in BoxData,<ht> in CellHgtData: ht>h && bt.box_no != b.box_no)(boxloc[<bt.box_no,l,w,ht>]) <= 500*boxloc[<b.box_no,l,w,h>]; 
}

In the problem, I have a set of boxes which I am trying to fit into a container, thus maximizing utilization. I have divided the container into equal cells and
boxloc<bt.box_no,l,w,ht> is the decision var that a box bt is in a cell with coord l,w,h . The constraint above restricts the amount of weight that can sit on top of another box, 500 being the limit. It checks for the boxes in same l,w but height > h. Though, I have boxes all of 100 kgs, but nothing is getting onto level 2, which is weird.

Can anybody please help me figure out this issue.
#DecisionOptimization
#MathematicalProgramming-General