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Module: Purchase

Entity: purchase.order

Compute Method: _amount_all

Inputs Method Outputs 
AccountTax = self.env['account.tax']
for order in self:
            order_lines = order.order_line.filtered(lambda x: not x.display_type)
            base_lines = [line._prepare_base_line_for_taxes_computation() for line in order_lines]
            AccountTax._add_tax_details_in_base_lines(base_lines, order.company_id)
            AccountTax._round_base_lines_tax_details(base_lines, order.company_id)
            tax_totals = AccountTax._get_tax_totals_summary(
                base_lines=base_lines,
                currency=order.currency_id or order.company_id.currency_id,
                company=order.company_id,
            )
            order.amount_untaxed = tax_totals['base_amount_currency']
            order.amount_tax = tax_totals['tax_amount_currency']
            order.amount_total = tax_totals['total_amount_currency']
            order.amount_total_cc = tax_totals['total_amount']

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