That it is possible to decide that the value of a service is “x” until a certain date, and from that date it increases or decreases to “y” (for example to readjust the tariff starting in January 2024). This can also be useful if you want to do something like “black days” where services are available for a limited time at a lower cost. Basically, it is being able to define a range of dates where the value of a certain service changes temporarily or indefinitely.
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