[IMP] sale_stock: display quantity available in other warehouses

When we are creating a sale order line of a product that doesn't have
sufficient quantity in stock, we get a warning saying that you don't
have the quantity entered in stock.

We improved this warnig by showing the remaining quantities in the other
warehouses of the company.

addons/sale_stock/models/sale_order.py

@@ -176,9 +176,12 @@ class SaleOrderLine(models.Model):
                             (self.product_uom_qty, self.product_uom.name, product.virtual_available, product.uom_id.name, self.order_id.warehouse_id.name)
                     # We check if some products are available in other warehouses.
                     if float_compare(product.virtual_available, self.product_id.virtual_available, precision_digits=precision) == -1:
-                        message += _('\nThere are %s %s available accross all warehouses.') % \
+                        message += _('\nThere are %s %s available across all warehouses.\n\n') % \
                                 (self.product_id.virtual_available, product.uom_id.name)
-
+                        for warehouse in self.env['stock.warehouse'].search([]):
+                            quantity = self.product_id.with_context(warehouse=warehouse.id).virtual_available
+                            if quantity > 0:
+                                message += "%s: %s %s\n" % (warehouse.name, quantity, self.product_id.uom_id.name)
                     warning_mess = {
                         'title': _('Not enough inventory!'),
                         'message' : message