This parameter is used to know how the price list structure acts on the corresponding amount column: Yes means that the column is filled by the price list. Thus it is necessary to enter the column value when entering the price list lines. No means that this column is not defined in the price list (but another price list is likely to fill it). Initialization means that this column is not filled by the price list, but on the other hand no search for another value is performed in a price list rule with less priority.