SCIP solver multiple objective functions with weights in Java

[jaimeviej]

Hello,

I'm new in constraint programming.
I'm trying to solve a problem that requires a multi objective function(o.f.) such as:
o.f.: obj1+ obj2 + ... + obj7
Each objective is multiplied by a weight (1000, 8, 1) and a parameter defined in arrays (d, um, m, cob, r, cost).

In the examples i've been learning from, it seems that when they add a coefficient it just adds it to the objective function.

In my case some values that I add are ignored and others ar not. I can't find why is this happening.

This is what I have:

//Parameters
      int[] d = {5,5};
      int[] um = {0,0};
      int[] m = {1,1};
      int[] cob = {0,0};
      double[] r = {0.009, 0.009};
      double[] cost = {0.01, 0.01};

//Objective function
      MPObjective objective = solver.objective();
      for (int j = 0; j < n_centers; ++j) {
          objective.setCoefficient(z[j], 1000); //value 1000
          objective.setCoefficient(z[j], 8*d[j]); //value 40
          for (int i = 0; i < n_products; ++i) {
               objective.setCoefficient(x[i][j], 1*um[j]); //value 0
               objective.setCoefficient(x[i][j], 1*cob[j]); //value 0
               objective.setCoefficient(x[i][j], 1*m[j]); //value 1
               objective.setCoefficient(x[i][j], 1*r[j]); //value 0.009
               objective.setCoefficient(x[i][j], 1*cost[j]); //value 0.01
   }
}

In the example I'm using there is only one possibility and it's cost should be over 1000. But the results value is 40.01.
When i comment the 40 cost line the result value is 1000.01. It seems that it's only taking the last line of each for.

Any thoughts on what am I doing wrong?

Thanks in advance!