Incorrect calculated measure total

GilbertQ is correct in that using DIVIDE( ) is a good idea to avoid divide by zero errors.   But in your case, you are just doing something "mathematically wrong".

Quantity    Price   SubTotal

2                3         6

3                4         12

Here the total is 18 (6+12), it is not  sum(quant) * sum(price) = 5 * 12 = 60.

I think you have something similiar going on?  Think we will need to see some sample data.

You might try:

Total Shipped Value = SUMX(REV_HistoryReport, CALCULATE(sum(REV_HistoryReport[Total Li Valu Amt])/sum(REV_HistoryReport[Ord Bill Unit Qty]) * sum(OpenOrders[Qty Filled])))