How can I add all orders done by a customer after 12 motnhs of the first transaction

[ligalbert]

I want to add all orders my customer did in a 12 month period from the time of the first transaction.  is there a measure that can help me with that 

[amitchandak]

@ligalbert , Try a meausre like

var _min = calculate(Min(Table[Date]), allexcept(Table, Table[Customer]) // in case you have customer dim. use Fact as table , in first argument
var _max = date(year(_min)+1 , month(_min), Day(_min)
return
calculate(Sum(Table[Date]), datesbetween(Date[Date], _min, _max))