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[Launchpad Bug Tracker <720919@xxxxxxxxxxxxxxxxxx>]

** Branch linked: lp:~zaber/openobject-addons/report-sale-div-zero

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https://bugs.launchpad.net/bugs/720919

Title:
  Report sales by category of products has divide by zero error

Status in OpenERP Modules (addons):
  New

Bug description:
  If some sales order lines have negative quantities, then the total
  units sold for a month in a particular category and sales order state
  can be zero. If the total is zero, then you can get a divide by zero
  in the Sales by Category of Products report that is part of the
  report_sale module.

  Detailed steps to reproduce:
  1. Create a new database with demo data. Select the manufacturing industry profile and leave all the other settings as the defaults.
  2. Install the report_sale module.
  3. Create a new sales order.
  4. Set the customer to Agrolait and the date ordered to one month ago.
  5. Add a new sales order line with all the default fields, plus Product Uom PCE, description "Paper plate", and unit price 2.00.
  6. Add a second line with all the default fields, plus Quantity UoM -1.00, Product Uom PCE, description "Napkin", and unit price 1.00.
  7. Confirm the sale order.
  8. From the Sales menu, choose Reporting: All Months: Sales by Category of Products.

  Expected behaviour: see the chart.

  Actual behaviour: Division by zero error.

  I am running OpenERP 5.0.15 on Ubuntu 10.04.