This not an Odoo characteristics but more of a general PLM / Material Management rule: 

Materials with the same revision/version should be "equivalent" from a form/fit/function point of view. In other hand, if you have a bucket of the same material with different versions/revisions, you should be able to blindly take one and assemble it with the other parts of the BOM without consequences. This is why revisions or versions should not impact inventory.   

If you want (or need) to make a distinction between 2 parts: change the material number!

So why bother with revision you would ask me? Sometime you want to track a change on a material that is not affecting the 3F rule: think about an electronic board that can be produced either with chip A from supplier A and chip B from supplier B. If the board behave exactly the same with both chips, you may want to use 2 versions to quickly identify them (when they return for repair f. ex.) But as they are interchangeable, you wont be able to identify them in your inventory...

And finally if you really need to track "versions" in your inventory, make them part of the material number (or internal reference as it is called in Odoo). 

Something like 1234-01 

Where 1234 is the root number that uniquely identify your material "family", -01 is the "version" that you can "increase" in case you need a new evolution of your material that is not compatible/interchangeable with the previous "version". You would go to 1234-02. This is a new material number, identified separately in the inventory. But this "rev roll" has a cost: you need to manage it with a proper ECO process and you need to maintain all the BOMs this material is used in. This may have a cascading effect where the parents could become not interchangeable anymore (you will also need to do a rev roll on the parent) or not (in which case, you can simply change the revision/version of the parent...