When booking in an ASN for products without dims, weight or barcode info, have an optional method to input them at that point. As this would mean that no products enter our 3PL without this required info recorded. for billing and shipping effectively.
This seems like the most logical point to ask for them to be added. and Would slip into the workflow quite well.
Have an option that automatically populates if an item needs a weight/dims recorded and goods in time - rather than this possibly being missed etc. Makes it clear for the goods in team to be able to tell what items needs details.