[FIX] stock: force group by date when ordered by date

When displaying forecasted inventory if there is no default order,
the default order forced on date and id. In that case, if the date is
not in the "group by", it causes warning.

With this commit, the date is forced in the SQL view.

closes odoo/odoo#32633

Signed-off-by: Raphael Collet (rco) <rco@openerp.com>

addons/stock/report/report_stock_forecast.py

@@ -129,6 +129,8 @@ class ReportStockForecat(models.Model):
         WHERE
             final.product_qty != 0 OR final.reference = 'Starting Inventory'
         %s
+        ORDER BY
+            date
         )
         """ % (self._select(), self._left_join(), self._groupby())
         self.env.cr.execute(query)
@@ -185,7 +187,6 @@ class ReportStockForecat(models.Model):
         order to analyze different quantities in different situations.
         """
         # Sort result by date_expected and id.
-        orderby = 'date, id' if not orderby else orderby
         if 'cumulative_quantity' in fields and 'quantity' not in fields:
             fields.append('quantity')
         res = super(ReportStockForecat, self).read_group(domain, fields, groupby, offset=offset, limit=limit, orderby=orderby, lazy=lazy)