What controls the function to allocate sales tax to the item cost in PO receipt of goods/invoice entry

The client has a tax class "VT" for Vat Tax for European purchases. When that tax class is used on the PO line item, the calculated sales tax for that line item is allocated to the item cost, going to the inventory account. No dollars are posting to the sales tax GL account.

They do not used landed cost entry in purchasing.

I know this is a setup configuration somewhere, but I don't remember where.

Does anyone know where this is set up?

See the attached example.