Field help (REACSTPUR) 

The actual purchase cost corresponds to the total amount of the invoices/credit memos allocated to the line. These are the supplier invoices/credit memos, as well as the additional invoices and the credit memos on additional invoices, as long as they are validated.

The actual purchase cost is not available for modification. It is only displayed if the entry transaction authorizes it. It is expressed in the currency of the company.

SEEWARNING This information is never calculated during the creation process, but only when saving the order.