Comment 1 for bug 691534

Yes, this is a poor display - not quite a but but it certainly should be improved.
The problem lies in the way the values are collected: OpenERP searches for all products that have been in the location by grouping stock moves by product.
Because of this, 0 quantities cannot be filtered easily: to achieve this, we would need to be able to filter results AFTER they have been grouped. In Postgres, that would translate by a 'having' clause.
We have made a proposal to add such a feature: please go ahead and review it here: https://code.launchpad.net/~numerigraphe/openobject-server/trunk-read_group-having/+merge/104579
The server, addons and client all have to be patched.
Lionel Sausin.