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# -*- coding: utf-8 -*-
from odoo import models
class AccountTax(models.Model):
_inherit = "account.tax"
def _hook_compute_is_used(self, taxes_to_compute):
# OVERRIDE in order to fetch taxes used in purchase
used_taxes = super()._hook_compute_is_used(taxes_to_compute)
taxes_to_compute -= used_taxes
if taxes_to_compute:
self.env['purchase.order.line'].flush_model(['taxes_id'])
self.env.cr.execute("""
SELECT id
FROM account_tax
WHERE EXISTS(
SELECT 1
FROM account_tax_purchase_order_line_rel AS pur
WHERE account_tax_id IN %s
AND account_tax.id = pur.account_tax_id
)
""", [tuple(taxes_to_compute)])
used_taxes.update([tax[0] for tax in self.env.cr.fetchall()])
return used_taxes
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