I'm new to Odoo, and using Odoo 13.

There is a sale module in my company, and one product depends to another. So when we create a new invoice (account.move), we must add new invoice line (account.move.line) of depended product.

My code goes like:

         new_line = invoice_line_ids.new({
                    'move_id': self.id,
                    'product_id': product_id.id,
                    '_dependency': True,
                    'quantity': 1.0,
                    'sequence': sequence,
                    })

But there is another problem: my new account move line did not compute in account_move.amount_untaxed and account_move.amount_total. For sometimes passing by, I found this function in model AccountMove for calculating those 2 fields:

        @api.depends(
            'line_ids.debit',
            'line_ids.credit',
            'line_ids.currency_id',
            'line_ids.amount_currency',
            'line_ids.amount_residual',
            'line_ids.amount_residual_currency',
            'line_ids.payment_id.state')
        def _compute_amount(self):

No matter what I did, calling it in my code, it just wouldn't goes as expected. But when I ran debug mode in my ide, anytime a new account.move.line added, it triggered.

May I ask why?