There is a Field available on the Location Card which needs to be considered when setting up Clever Packing.  If you have a Location where Sales Orders need to be packed, then the below Field should be Enabled.  

 

When this Field is Enabled, the Packing Required Field will be automatically Enabled on Warehouse Shipments created for that Location.  The Field can then be manually Disabled on specific Warehouse Shipments if Packing is not required.