v2017 Premium. The end user is changing the inventory valuation method from average cost to serial for a couple of thousand items. I know the steps necessary to change the valuation. The main concern is once the valuation has been changed, how do I get the item quantities back into inventory at the correct cost. The costs can vary significantly. Do we simply bring all the serialized items back in at the average cost? Should they use a physical count to add the items back to inventory and let the system calculate the cost, or should they use inventory transaction receipts or adjustments and specify the unit cost for each item?