A check mark in this field indicates that the invoice discount will be calculated for the current service line.
The contents of the Allow Invoice Disc. field is determined by the contents of the similar field in the Item card for the item specified on the service line: the program places a check mark in this field if the Allow Invoice Disc. field on the Invoicing tab of the Item Card for the item contains a check mark.
You can clear the check box, which will mean that no invoice discount will be applicable to the current service line.