trytond-sale-shipment-tolerance 6.0.0 Tryton module to define tolerance for sale shipment

The Sale Shipment Tolerance module adds under and over shipment tolerance on the sale. If the quantity of a sale line is under shipped but inside the tolerance percentage, then the line will be considered as fully shipped and no back-order will be created. If the quantity of a sale line is over shipped more than the tolerance percentage, then a warning is raised.