Vehicle shouldn't serve any node less than given demand [Multi vehicle types]

[MashhoodAhmad-251]

I have already defined various constraints on a working code with multiple vehicle types. Now, I want to add a new constraint.

For a given vehicle, it shouldn't service nodes with less than given demand. So, when this constraint will be applied to one type of vehicle, any nodes less than that demand will be served by OTHER vehicles [which won't have this constraint.]

for i in range(vehicle_type_A_starting index, vehicle_type_A_ending index):
  routing.SetArcCostEvaluatorOfVehicle(transit_callback_index_for_vehicle_type_A, i)

for i in range(vehicle_type_B_starting index, vehicle_type_B_ending index):
  routing.SetArcCostEvaluatorOfVehicle(transit_callback_index_for_vehicle_type_B, i)
  #NEW CONSTRAINT FOR THIS VEHICLE TYPE
  # routing.solver().Add((routing.ActiveVehicleVar(int(i)) * capacity_dimension.[? minimum demand each visited node ?] >= 20)
  
  `

This way, any nodes with less than 20 demand will be catered by vehicle type A.

1. How to implement this constraint?
2. How to implement this constraint while also dealing with conflict of unused vehicles since they will have demand of 0 but we are specifying that no demand should be less than 20 for vehicle type B.

[MashhoodAhmad-251]

Solution:

for node_index in range(len(nodes)): if nodes[node_index] according to criteria: routing.SetAllowedVehiclesForIndex(list(allowed_vehicle_list)), node_index)

I have just banned my vehicle type B from visiting nodes with demand less than X.