Field help (DISCRGVAL1) 

The different discount and charge fields that appear at the level of each return line are determined via the structure code associated with the supplier in their record.
The values contained in these fields come from the price list search and can be modified if the associated reason allows it (or if the reason value given to the UPDPRIPUR parameter allows it).
The Actions icon is used to view all the reasons associated with the price and discounts and to modify, if necessary, the reasons assigned to each of the columns.