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This allows you to define that 2 jobs should be in a specific order:
<First> and then <Second>. No matter which resource period, they are assigned to.
Furthermore it can be specified how many minutes they should be apart.
You can define an optimal level and minimum / maximum.
If you define cost, the optimizer will try to get closer to optimal. Cost is measured per minute and is usually a fairly small number.
If cost is 0, there is no need to specify optimum.
This can be used to plan for visiting a customer every N days. An example with twice a year:
Job1: Use time window = Jan - June
Job2: Use time window = July - December
First = Job1
Second = Job2
MinInterval = 182 * 24 * 60 * (0.9) = 235872
MaxInterval = 182 * 24 * 60 * (1.1) = 288288
OptimalInterval = 182 * 24 * 60 = 262080
Cost = 0.01 (or 14.4 units for every day)
This keeps the 2 visits 6 months +/- 10% apart.