Estimated Delivery date based on cumulative count

learner03 OK, I simplified the equation and was able to eliminate the GENERATESERIES. Not sure why I didn't do it this way the first time. Try this one:

FIFO 2 = 
    VAR __DaysToFulfill = 10
    VAR __ItemCode = [Item Code]
    VAR __Date = [Date]
    VAR __QtyToFulfill = SUMX(FILTER('BackOrders',[Item Code] = __ItemCode && [Date] <= __Date),[Backorder Qty])
    VAR __Table = FILTER('OpenPurchaseOrders',[Item Code] = __ItemCode)
    VAR __Table1 = 
        ADDCOLUMNS(
            ADDCOLUMNS(__Table,"__tqty",SUMX(FILTER(__Table,[ETA W/H] <= EARLIER([ETA W/H])),[Quantity])),
            "__LoopCounter",[__tqty] - __QtyToFulfill
        )
    VAR __TargetDate = MINX(FILTER(__Table1, [__LoopCounter] >= 0),[ETA W/H])
    VAR __FulfillmentDate = IF(__TargetDate = BLANK(),BLANK(),__TargetDate+__DaysToFulfill) 
RETURN
    __FulfillmentDate