box Serial with partial Quantity

We have enabled lot control and serial control - Example : Item A - Primary UOM is BOX20 (20 Each in BOX) - We placed order of 2 box20 and received in inventory with same Lot number but two different serial number - Now we want to issue Quantity of 10 Each for First Serial but its not allowing , getting following message

Error: For items under serial control, you must enter a transaction quantity that corresponds to an integer value in terms of the item's primary UOM. (INV-2415376)

is it possible to achieve this ?