Originally posted by: gustavgans123

Hi,

my attached routing model works fine, but has some problem: Even though the vessel travels between node 0 and node 3 -> y[0,3,1,1] = 1 it does not include the costs for travelling between 0 and 3. That would be Ct[i,j,v] = 299.

Also, Alex, pointed out, that my model is still feasible if I put: dvar boolean x[m in M, v in V, s in S] in 0..0 - which is not normal...

There must be something wrong with the constraints. Any hint, what it could be? I can not find the problem. I attached the model, the data, the model in a written form and the original model, out of which I extracted my model.

I appreciate any help a lot, as I am a bit stuck. cant work with this model and extend it, until the very basic version works properly.

regards,

leif

Originally posted by: gustavgans123

I solved this problem.

I added a constraint so that all maintenance tasks are performed except for .

forall

(m in M, v in V, s in S) // All maintenance tasks have to be performed

sum(m in M) x[m,v,s] >= m;