When will the difference after rounding in cost accounting be adjusted and calculated

I purchased an item with a total price of 1000 and a quantity of 30. In cost accounting, the unit price of the item is calculated as 30.333. When I issue the item individually, it is rounded to 33. However, after all items are issued, the total price is still 1000. I would like to know when the unit price is rounded forward, whether it is at the last time or in the last few times