The NEXTNMONTH function can be used to select data from a given measure, for a specified number of months after the current month. It should be used in conjunction with the SELECT clause and with an aggregate function like SUM or AVERAGE.
NEXTNMONTH(number_of_months)
number_of_months – The number of months for which data has to be fetched. Required.
Range of data.
NEXTNMONTH(15)
//Returns data for 15 months before the current month
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NEXTNMONTH