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Module: Purchase

Entity: purchase.order

Compute Method: _amount_all

Inputs Method Outputs 
for order in self:
            order_lines = order.order_line.filtered(lambda x: not x.display_type)

            if order.company_id.tax_calculation_rounding_method == 'round_globally':
                tax_results = self.env['account.tax']._compute_taxes([
                    line._convert_to_tax_base_line_dict()
                    for line in order_lines
                ])
                totals = tax_results['totals']
                amount_untaxed = totals.get(order.currency_id, {}).get('amount_untaxed', 0.0)
                amount_tax = totals.get(order.currency_id, {}).get('amount_tax', 0.0)
            else:
                amount_untaxed = sum(order_lines.mapped('price_subtotal'))
                amount_tax = sum(order_lines.mapped('price_tax'))

            if order.currency_id.compare_amounts(order.amount_untaxed, amount_untaxed):
                order.amount_untaxed = amount_untaxed
            order.amount_tax = amount_tax
            order.amount_total = order.amount_untaxed + order.amount_tax

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