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Hello,
You need to first create a measure that calculates de maximum qty:
[MAX] :=CALCULATE(MAX(Table[QTY]);ALL(Table))
After this you just need to count the number of Order_Id’s where Table[QTY]=[MAX]
[COUNT_MAX] =Â CALCULATE(COUNT(Table[ORDER_ID]);FILTER(Table;Table[QTY]=CALCULATE(MAX(Table[QTY]);ALL(Table))))
I attached an Excel with these 😉