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How can i create 1:x relationships where x is random number?



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For example, if i have order and customer and between customers-orders relationships i want only 5 orderes for one customer,

can i insert validation controls in a form? for example, if the order that i'm adding to customer is the 6th order for this customer, i should don't add order. is it possible?

or are there other ways to implement relationships with custom cardinality?

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