Hi,

To retrieve the products of a sale order where the `product_uom_qty` does not match `qty_delivered` after validating the associated stock picking, you can modify the code as follows:

def action_print_errors(self):
    sales = self.env['sale.order'].search([('state', '=', 'sale')])
    sales_list = []
    for sale in sales:
        sale_dict = {
            'id': sale.id,
            'name': sale.name,
            'order_line': [],
        }
        for line in sale.order_line:
            line_dict = {
                'id': line.id,
                'product_id': line.product_id.id,
                'product_name': line.product_id.name,
                'product_uom_quantity': line.product_uom_qty,
                'qty_delivered': line.qty_delivered,
                'different': line.product_uom_qty - line.qty_delivered
            }
            # Check if stock picking is validated for this product
            stock_picking = self.env['stock.picking'].search([
                ('sale_id', '=', sale.id),
                ('state', '=', 'done'),
                ('product_id', '=', line.product_id.id)
            ], limit=1)
            if stock_picking and line_dict['product_uom_quantity'] != line_dict['qty_delivered']:
                sale_dict['order_line'].append(line_dict)
        sales_list.append(sale_dict)

In this updated code, we perform an additional check to validate the associated stock picking for each product within the sale order. We use the `search()` method on the `stock.picking` model to find a validated stock picking with the following criteria:

- `sale_id` matches the current sale order `sale.id`

- `state` is set to 'done' (validated)

- `product_id` matches the current product `line.product_id.id`

If a validated stock picking is found for a product and the `product_uom_qty` does not match `qty_delivered`, we add the product details to the `order_line` list within the `sale_dict`.

Now, the `sales_list` will contain the sale orders and their respective products where the `product_uom_qty` does not match `qty_delivered` after validating the associated stock picking

Regards