Show returnable items during goods receive flow

Current behavior, when using returnable items (http://wiki.produmex.name/doku.php?id=implementation:wms:returnableitems#:~:text=Returnable%20items%2C%20such%20as%20logistic,procedure%20to%20manage%20returnable%20items.) the system automatically books the calculated amount of returnable items defined in the BOM to the goods receipt po. 

The issue with the current behavior is that when receiving meat/cheese or other raw materials that are sold by weight there is always a difference between the calculated amount and the received amount of returnable items. 

Solution, when an purchase item has an BOM with returnable items show a screen on the fatclient(handheld) with the calculated amount of returnable items and give the logistics employees the option to adjust the calculated amount of returnable items. (like the screen below)

To enable or disable the wanted behavior above a check box can be placed on the produmex purchase tab of the item master data.