Hello, I am trying to modify the invoice report in OpenERP 6.1.

The problem I have is that I need to include fields to show de Production Lot of the items that are sold. It seems that this information corresponds to different variables that are not included in the report (OpenERP REport Designer --> Add a field-->Variable), this is data from picking list. Anyone could tell me how to do this?

IT could be fine, if it is not possible this, uf anyone could explain me how to do a query for this field in the report to show this information

Thanks in advance