The Requirements Group (TRG) B.V.
Unfortunately this app is lacking an important feature. If a product is out of stock and you wish to fulfill it later, it will not allow you to proceed with the partial packing list. So for products that are on back order this is useless. If it had that feature, we would definitely use it.
This feature is now available . On the settings page if you tick "Partial Shipments" you will be able to change the quantities being fulfilled and return to the order later to fulfill the remaining quantity.