There are some things that you'll have to keep in mind when creating a new shipment for your POs:
Ship date: if the setting on the grower options tab is enabled, make sure that the AWB ship date matches the ship date of your POs, if they don't, the system will not let you add the items to that shipment.
Confirm POs: only confirmed POs can be added to an AWB; otherwise, growers won't be able to see them on the Pending Orders window.
AWB status: users can make any change on the AWB as long as it's open. The system will automatically close the AWB two days after the ship date to prevent any alterations.
Reprint labels: whenever a change is made, all labels have to be printed again.