Hello,

Please try this code,

@api.depends('product_uom_qty', 'discount', 'price_unit', 'tax_id','receive_in_advance')
def _compute_amount(self):
    """Compute the amounts of the SO line."""
    for line in self:
        price = line.price_unit * (1 - (line.discount or 0.0) / 100.0)
        if line.product_uom_qty and line.receive_in_advance:
            price = price - (line.receive_in_advance/line.product_uom_qty)
        taxes = line.tax_id.compute_all(price, line.order_id.currency_id, line.product_uom_qty, product=line.product_id, partner=line.order_id.partner_shipping_id)
        line.update({
            'price_tax': sum(t.get('amount', 0.0) for t in taxes.get('taxes', [])),
            'price_total': taxes['total_included'],
            'price_subtotal': taxes['total_excluded'],
        })                          

If you use UOM, then please change the code accordingly.

Hope this will help you,

Thanks