Calculated Column for New Customer

I figured out how to code my calculated column. I've split the DAX command into two calculated columns..

1.  Previous Order = CALCULATE(MAX(v_PBI_SalesData[Document Date]), FILTER(v_PBI_SalesData, v_PBI_SalesData[Customer Number] = EARLIER(v_PBI_SalesData[Customer Number]) && v_PBI_SalesData[SOP Number] < EARLIER(v_PBI_SalesData[SOP Number])))

This calculated column is simply returning the date of the previous order for this customer.

2. Opening Order = IF(v_PBI_SalesData[Previous Order]>v_PBI_SalesData[Document Date]-365, BLANK(), v_PBI_SalesData[Document Date])

The follow up calculated column is now returning a blank if the previous order to this order has been within the last year, OR returning the document date of the line if it is before 1 year ago.