To display weight unit on invoice PDF you can try this module :http://www.dolistore.com/lang-fr/crm-gestion-relation-client/208-Facture-avec-poids.html
But i don't really understand the problem, in your tea exemple, you create the product TeaBox(100*10g) with a weight of 1 kg. For the bottle of milk you said 1 dm3(l) in volume.
I think the point is more "where" this information is displayed. Actually it's only in porduct form.
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