If this setup is different from 0, the column in the invoicing element which number is corresponding is accumulated. The calculated amount is either entered, or calculated from a percentage entered according to the type of the column.
If this setup is entered, the value of the document lines will be cumulated in the corresponding invoicing element (See the Purchase invoicing elements and Sales invoicing elements documentations). If it is a column of the type Amount, the amounts are combined, if it is a column of the type Percentage, the calculated amounts are combined by applying the percentage to the line amount.
This column is only accessible if the discount or charge is not used in the calculation of the line net price. The invoice footer used must be defined as present in the order line and the value type must be of the amount type.