Selection of a date range that is unique everytime an entry is done

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I want to select a range that is unique to each order type. While making a new entry, the start date and end date should not lie in the date range that already exist every time a new entry is made. I am working on a microflow ,but it checks only the first range selected of the order type. How to check the rest of the entries as well while creating a new entry.
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