Actual Cost in landed cost management shipment calculated based on invoice item quantity

Hi Experts,

I have two items in my shipment and volume wise they are equal in the shipment. Quantities are different. When I created Estimated charges, I was able to get equal freight charges.

However, When I invoiced my PO by matching the LCM receipt, I could see actual cost column is not distributing equally. I see it has distributed based on the quantity's proportions and not the volume.

I hope I am able to explain my problem.

Is there any way I can pass customized cost values during actual costing as well like the way I could customize while I was creating estimated costs?