If there are multiple UN numbers in an overpack, as shown in Notes: 1. under DGR 184.108.40.206.2 Step 7, : "Where an overpack contains more than one UN number, the total quantity of dangerous goods should be shown by UN number. " although. not a mandatory requirement, the quantity by each UN number "should " be shown. Consequently, the net quantities shown are not subject to removal. When there is only one overpack made, as shown in DGR Figures 8.1.J and 8.1.K, the net quantity need not be indicated.