Field help (PTHSTCNUM) 

The management of landed costs makes it possible to quantify the routing costs of the goods ordered from a supplier and to allocate them to the products upon order, receipt or invoice. These costs are used for the calculation of the purchase cost and stock cost.
The evaluation of these costs can be performed according to one of the two following methods:

Only one method can be used, the choice of this method is performed at the level of the product management.

A cost structure details all the costs that are considered as fixed costs and can be identified at the time of the purchase. These costs are expressed in the company currency and document currency.
The presence of this field depends on the entry transaction used.
When it is managed, this information is initialized: 

This information can never be modified.

The costs taken into account in the cost structure are displayed in the window that can be accessed via the "Cost structure detail". It remains possible to adjust the calculated amounts.
The costs are also displayed in the ‘Direct costs’ grid in the window that can be accessed via right-click option "Line cost" (in the ‘Cost detail’ section).