[ADD] Generic avatax oca rounding

osi_avatax_rounding_fix/README.rst

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+.. image:: https://img.shields.io/badge/licence-AGPL--3-blue.svg
+    :target: http://www.gnu.org/licenses/agpl-3.0-standalone.html
+    :alt: License: AGPL-3
+
+========
+Overview
+========
+
+* Correct rounding issues on avatax lines
+
+
+=======
+Credits
+=======
+
+* Open Source Integrators <http://www.opensourceintegrators.com>
+
+
+Contributors
+------------
+
+* Tirth Patel <tpatel@opensourceintegrators.com>
+* Raphael Lee <rlee@opensourceintegrators.com>

osi_avatax_rounding_fix/__init__.py

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+from . import models

osi_avatax_rounding_fix/__manifest__.py

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+{  # noqa
+    "name": "OSI Avatax Rounding Fix",
+    "summary": "OSI Avatax Rounding Fix",
+    "version": "17.0.1.0.0",
+    "license": "LGPL-3",
+    "author": "Open Source Integrators",
+    "maintainer": "Open Source Integrators",
+    "website": "https://github.com/ursais/osi-addons",
+    "category": "Accounting",
+    "depends": [
+        "account_avatax_sale_oca",
+    ],
+    "data": [],
+    "application": False,
+    "installable": True,
+    "auto_install": False,
+}

osi_avatax_rounding_fix/models/__init__.py

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+from . import account_tax

osi_avatax_rounding_fix/models/account_tax.py

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+from odoo import api, models
+
+
+class AccountTax(models.Model):
+    _inherit = "account.tax"
+
+    @api.model
+    def _prepare_tax_totals(
+        self, base_lines, currency, tax_lines=None, is_company_currency_requested=False
+    ):
+        vals = super()._prepare_tax_totals(
+            base_lines, currency, tax_lines, is_company_currency_requested
+        )
+        if vals.get("amount_untaxed"):
+            vals["amount_untaxed"] = round(vals["amount_untaxed"], 2)
+        if vals.get("amount_total"):
+            vals["amount_total"] = round(vals["amount_total"], 2)
+        return vals