Hello everyone!

I’m trying to write a constrain like this:

```
eq(c).. SUM((a,b), f1(a,b,c)) =e= SUM (a, f2(a,b))
```

As expected, i get error 149 “Uncontrolled set entered as constant” because b in the right part of the equation is uncontrolled.

But this is exactly the constrain i want to set. (b and c are two set with the same number of elements, so the results of both SUM is an “array” with 5 elements and they should be comparable).

Do you know how can i write this constrain?

Thanks