Hi.

I need to define a grid. The grid has knots and at some knots.there is consumption.

The balance of what is transferred into a knot must be equal to the sum of what is going away plus consumption (if any).

I have the sets

i /K1, K2, K3, K4, K5/

j /K1, K2, K3, K4, K5/

Which means from and to a knot.

My equation to get the balance working:

eq1… sum(i, transportation(i,j)) =e= sum(j, transportation) + consumption(i,j)

But this gives me either uncontrolled set entered as constant or … is already under control.

Could you help me to define that equation correctely?

Thank you

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