When i produce a delivery order with odoo v7, weight on report is always empty !

I searched the error ... here's what I found:

- Delivery order use 'addons/stock/report/picking.rml'

- Object is stock.picking

an extract from 'picking.rml'

../..

[[repeatIn(objects,'picking')]]

../..

[[ 'weight' in picking._columns.keys() and picking.weight or '']] ->> always return an empty string because weight don't exist !

Debug mode ... in object stock.picking.out (or in) there are no weigth defined ...

In the old V7 (before middle 2014 year), there was ! and delivery order print weight correctly.

In the current V7, no weight :(

I looked at the python code of stock.py ...

I search on github, i found this:

https://github.com/odoo/odoo/issues/367 

I continue to look, but if you have an idea or a track to follow it would be very useful to me. Thank you.

NB: I suppose it's the same for : weight_net, volume, carrier.