When calculate price for raw material, the default order type is Purchase order. So logic use the latest cost price as calculation result.
When calculate price for SFG, "Production order" type is used in the calculation. So the "Inventory price" is used as setting in calculation group.
User should be able to calculate the inventory price for Raw material when the Item - Calculation group is mentioned as inventory Price model (but system is not calculating for as per the inventory price.)