Planned Delivery Cost and Unplanned Delivery Cost

What is planned delivery cost and unplanned delivery cost?
By: Chung
1) A delivery costs that are planned in a purchase order and are entered in the system (invoice).
2) A delivery costs that are not planned in a purchase order and are not entered in the system until the invoice is received.
Planned delivery costs:
Planned delivery costs are agreed upon with the vendor, a carrier, or a customs office before the purchase order is created. You enter them in the purchase order.
Planned delivery costs can be differentiated as follows:
Origin of Costs 
i) Freight charges 
ii) Customs charges
Calculation of Costs 
i) Fixed amount, irrespective of delivered quantity 
ii) Quantity-dependent amount 
iii) Percentage of value of the goods
Unplanned Delivery Costs:
Unplanned delivery costs were not agreed on in the purchase order and are not entered until the invoice is received.
You can enter the unplanned delivery costs in the invoice document alongside the costs incurred. You can post unplanned delivery costs as follows:
- Distribute them prorated to calculated invoice items 
- Post them to separate G/L accounts 
The system distributes the unplanned delivery costs automatically in the ratio of the value invoiced so far to the values in the current invoice. The system posts unplanned delivery costs to a separate G/L account. Therefore, the unplanned delivery costs do not debit stock accounts or account assignment objects.