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Conditional tariff: if you select tariff A, then tariff A must be selected by the customer in order to select the tariff you are configuring. A typical business case is to make the Child tariff available only if an Adult tariff is added.
Limitation: this does not work on season tickets.
Trigger quantity: if a conditional tariff is associated, then set the minimun quantity needed to make the current tariff available to the customer
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