[18.0][MIG] uom_rounding_coherence: Migration to 18.0

uom_rounding_coherence/README.rst

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+======================
+UoM Rounding Coherence
+======================
+
+.. 
+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+   !! This file is generated by oca-gen-addon-readme !!
+   !! changes will be overwritten.                   !!
+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+   !! source digest: sha256:d646eddf3ef1d6ff89719e1651d153ab196194e731190ebbcaa2e135d9ff4a8e
+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+.. |badge1| image:: https://img.shields.io/badge/maturity-Beta-yellow.png
+    :target: https://odoo-community.org/page/development-status
+    :alt: Beta
+.. |badge2| image:: https://img.shields.io/badge/licence-AGPL--3-blue.png
+    :target: http://www.gnu.org/licenses/agpl-3.0-standalone.html
+    :alt: License: AGPL-3
+.. |badge3| image:: https://img.shields.io/badge/github-NuoBiT%2Fodoo--addons-lightgray.png?logo=github
+    :target: https://github.com/NuoBiT/odoo-addons/tree/18.0/uom_rounding_coherence
+    :alt: NuoBiT/odoo-addons
+
+|badge1| |badge2| |badge3|
+
+This module adds validation to ensure that Unit of Measure (UoM)
+rounding precision is coherent with the conversion ratio to the
+reference unit, preventing precision loss during conversions.
+
+When converting quantities between UoMs in the same category, a
+non-reference UoM whose rounding is too coarse relative to its
+conversion factor will lose precision beyond the reference UoM's
+rounding.
+
+**Example Problem:**
+
+If the reference UoM has rounding 0.001 and a secondary UoM with ratio
+1.141 has rounding 0.01, each conversion can introduce up to ±0.004
+error in reference units — enough to accumulate visible discrepancies
+over multiple transactions.
+
+**The Validation:**
+
+The module checks that converting the UoM's rounding step to reference
+units (rounding / factor) does not exceed the reference UoM's rounding.
+This ensures data consistency and prevents precision-related errors.
+
+**Table of contents**
+
+.. contents::
+   :local:
+
+Configuration
+=============
+
+No configuration is needed. The module automatically validates UoM
+rounding coherence when you create or modify UoMs.
+
+Usage
+=====
+
+When creating or modifying Units of Measure:
+
+1. Go to *Inventory > Configuration > UoM Categories*
+2. Create or edit a UoM
+3. If the rounding precision is too coarse for the conversion ratio, the
+   system will show a validation error
+4. The error message will indicate:
+
+   - The UoM with the problem
+   - Its current rounding value
+   - The conversion factor
+   - The effective rounding in reference units
+   - The reference unit and its rounding
+
+5. To fix the error, either:
+
+   - Decrease the rounding of the problematic UoM, or
+   - Increase the rounding of the reference UoM (if appropriate)
+
+Bug Tracker
+===========
+
+Bugs are tracked on `GitHub Issues <https://github.com/NuoBiT/odoo-addons/issues>`_.
+In case of trouble, please check there if your issue has already been reported.
+If you spotted it first, help us to smash it by providing a detailed and welcomed
+`feedback <https://github.com/NuoBiT/odoo-addons/issues/new?body=module:%20uom_rounding_coherence%0Aversion:%2018.0%0A%0A**Steps%20to%20reproduce**%0A-%20...%0A%0A**Current%20behavior**%0A%0A**Expected%20behavior**>`_.
+
+Do not contact contributors directly about support or help with technical issues.
+
+Credits
+=======
+
+Authors
+-------
+
+* NuoBiT Solutions SL
+
+Contributors
+------------
+
+- `NuoBiT <https://www.nuobit.com>`__:
+
+  - Eric Antones eantones@nuobit.com
+  - Deniz Gallo dgallo@nuobit.com
+
+Maintainers
+-----------
+
+This module is part of the `NuoBiT/odoo-addons <https://github.com/NuoBiT/odoo-addons/tree/18.0/uom_rounding_coherence>`_ project on GitHub.
+
+You are welcome to contribute.

uom_rounding_coherence/__init__.py

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+from . import models

uom_rounding_coherence/__manifest__.py

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+# Copyright 2026 NuoBiT Solutions SL - Eric Antones <eantones@nuobit.com>
+# Copyright 2026 NuoBiT Solutions SL - Deniz Gallo  <dgallo@nuobit.com>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl)
+
+{
+    "name": "UoM Rounding Coherence",
+    "summary": "Validates that UoM rounding precision is coherent"
+    " with the conversion ratio to prevent precision loss",
+    "version": "18.0.1.0.0",
+    "author": "NuoBiT Solutions SL",
+    "website": "https://github.com/NuoBiT/odoo-addons",
+    "category": "Product",
+    "depends": ["uom"],
+    "license": "AGPL-3",
+}

uom_rounding_coherence/i18n/ca.po

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+# Translation of Odoo Server.
+# This file contains the translation of the following modules:
+# 	* uom_rounding_coherence
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Odoo Server 18.0\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2026-02-17 00:00+0000\n"
+"PO-Revision-Date: 2026-02-17 00:00+0000\n"
+"Last-Translator: \n"
+"Language-Team: \n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: \n"
+"Plural-Forms: \n"
+
+#. module: uom_rounding_coherence
+#: code:addons/uom_rounding_coherence/models/uom_uom.py:0
+#, python-format
+msgid ""
+"Cannot validate rounding coherence for category '%(category)s': expected "
+"exactly one active reference unit of measure but found %(count)s."
+msgstr ""
+"No es pot validar la coherència d'arrodoniment per a la categoria "
+"'%(category)s': s'esperava exactament una unitat de mesura de referència "
+"activa però se n'han trobat %(count)s."
+
+#. module: uom_rounding_coherence
+#: code:addons/uom_rounding_coherence/models/uom_uom.py:0
+#, python-format
+msgid ""
+"The rounding precision of '%(uom)s' (%(uom_rounding)s) is too coarse for "
+"its conversion ratio (%(factor)s). When converted to the reference unit "
+"'%(ref)s', the effective rounding becomes %(effective)s, which exceeds the "
+"reference rounding of %(ref_rounding)s.\n"
+"\n"
+"To fix this, either decrease the rounding of '%(uom)s' or increase the "
+"rounding of '%(ref)s'."
+msgstr ""
+"La precisió d'arrodoniment de '%(uom)s' (%(uom_rounding)s) és massa "
+"gruixuda per al seu ràtio de conversió (%(factor)s). En convertir a la "
+"unitat de referència '%(ref)s', l'arrodoniment efectiu és %(effective)s, "
+"que excedeix l'arrodoniment de referència de %(ref_rounding)s.\n"
+"\n"
+"Per solucionar-ho, disminuïu l'arrodoniment de '%(uom)s' o augmenteu "
+"l'arrodoniment de '%(ref)s'."

uom_rounding_coherence/i18n/es.po

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+# Translation of Odoo Server.
+# This file contains the translation of the following modules:
+# 	* uom_rounding_coherence
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Odoo Server 18.0\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2026-02-17 00:00+0000\n"
+"PO-Revision-Date: 2026-02-17 00:00+0000\n"
+"Last-Translator: \n"
+"Language-Team: \n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: \n"
+"Plural-Forms: \n"
+
+#. module: uom_rounding_coherence
+#: code:addons/uom_rounding_coherence/models/uom_uom.py:0
+#, python-format
+msgid ""
+"Cannot validate rounding coherence for category '%(category)s': expected "
+"exactly one active reference unit of measure but found %(count)s."
+msgstr ""
+"No se puede validar la coherencia de redondeo para la categoría "
+"'%(category)s': se esperaba exactamente una unidad de medida de referencia "
+"activa pero se encontraron %(count)s."
+
+#. module: uom_rounding_coherence
+#: code:addons/uom_rounding_coherence/models/uom_uom.py:0
+#, python-format
+msgid ""
+"The rounding precision of '%(uom)s' (%(uom_rounding)s) is too coarse for "
+"its conversion ratio (%(factor)s). When converted to the reference unit "
+"'%(ref)s', the effective rounding becomes %(effective)s, which exceeds the "
+"reference rounding of %(ref_rounding)s.\n"
+"\n"
+"To fix this, either decrease the rounding of '%(uom)s' or increase the "
+"rounding of '%(ref)s'."
+msgstr ""
+"La precisión de redondeo de '%(uom)s' (%(uom_rounding)s) es demasiado "
+"gruesa para su ratio de conversión (%(factor)s). Al convertir a la unidad "
+"de referencia '%(ref)s', el redondeo efectivo es %(effective)s, que excede "
+"el redondeo de referencia de %(ref_rounding)s.\n"
+"\n"
+"Para solucionarlo, disminuya el redondeo de '%(uom)s' o aumente el "
+"redondeo de '%(ref)s'."

uom_rounding_coherence/models/__init__.py

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+from . import uom_uom

uom_rounding_coherence/models/uom_uom.py

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+# Copyright 2026 NuoBiT Solutions SL - Eric Antones <eantones@nuobit.com>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl)
+
+from odoo import _, api, models, tools
+from odoo.exceptions import ValidationError
+
+
+class UoM(models.Model):
+    _inherit = "uom.uom"
+
+    @api.constrains("rounding", "factor", "uom_type", "category_id")
+    def _check_rounding_factor_coherence(self):
+        """Ensure UoM rounding is fine enough relative to the conversion ratio.
+
+        When converting quantities between UoMs in the same category,
+        a non-reference UoM whose rounding is too coarse relative to
+        its conversion factor will lose precision beyond the reference
+        UoM's rounding. For example, if the reference UoM has rounding
+        0.001 and a secondary UoM with ratio 1.141 has rounding 0.01,
+        each conversion can introduce up to ±0.004 error in reference
+        units — enough to accumulate visible discrepancies over
+        multiple transactions.
+
+        The check: converting the UoM's rounding step to reference units
+        (rounding / factor) must not exceed the reference UoM's rounding.
+        """
+        categories = self.mapped("category_id")
+        for category in categories:
+            uoms = self.env["uom.uom"].search(
+                [
+                    ("category_id", "=", category.id),
+                    ("active", "=", True),
+                ]
+            )
+            ref_uom = uoms.filtered(lambda u: u.uom_type == "reference")
+            if len(ref_uom) != 1:
+                raise ValidationError(
+                    _(
+                        "Cannot validate rounding coherence for "
+                        "category '%(category)s': expected exactly one "
+                        "active reference unit of measure but found "
+                        "%(count)s."
+                    )
+                    % {
+                        "category": category.name,
+                        "count": len(ref_uom),
+                    }
+                )
+            for uom in uoms - ref_uom:
+                # Convert this UoM's rounding to reference units
+                # Using the same formula as _compute_quantity:
+                #   amount = qty / self.factor * to_unit.factor
+                # Since ref_uom.factor = 1.0:
+                #   rounding_in_ref = uom.rounding / uom.factor
+                rounding_in_ref = uom.rounding / uom.factor
+                if (
+                    tools.float_compare(
+                        rounding_in_ref,
+                        ref_uom.rounding,
+                        precision_rounding=ref_uom.rounding,
+                    )
+                    > 0
+                ):
+                    raise ValidationError(
+                        _(
+                            "The rounding precision of '%(uom)s' (%(uom_rounding)s) "
+                            "is too coarse for its conversion ratio (%(factor)s). "
+                            "When converted to the reference unit '%(ref)s', "
+                            "the effective rounding becomes %(effective)s, "
+                            "which exceeds the reference rounding of "
+                            "%(ref_rounding)s.\n\n"
+                            "To fix this, either decrease the rounding of "
+                            "'%(uom)s' or increase the rounding of '%(ref)s'."
+                        )
+                        % {
+                            "uom": uom.name,
+                            "uom_rounding": uom.rounding,
+                            "factor": uom.factor,
+                            "ref": ref_uom.name,
+                            "effective": rounding_in_ref,
+                            "ref_rounding": ref_uom.rounding,
+                        }
+                    )

uom_rounding_coherence/pyproject.toml

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+[build-system]
+requires = ["whool"]
+build-backend = "whool.buildapi"

uom_rounding_coherence/readme/CONFIGURE.md

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+No configuration is needed. The module automatically validates UoM
+rounding coherence when you create or modify UoMs.

uom_rounding_coherence/readme/CONTRIBUTORS.md

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+- [NuoBiT](https://www.nuobit.com):
+  - Eric Antones <eantones@nuobit.com>
+  - Deniz Gallo  <dgallo@nuobit.com>

uom_rounding_coherence/readme/DESCRIPTION.md

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+This module adds validation to ensure that Unit of Measure (UoM)
+rounding precision is coherent with the conversion ratio to the
+reference unit, preventing precision loss during conversions.
+
+When converting quantities between UoMs in the same category, a
+non-reference UoM whose rounding is too coarse relative to its
+conversion factor will lose precision beyond the reference UoM's
+rounding.
+
+**Example Problem:**
+
+If the reference UoM has rounding 0.001 and a secondary UoM with ratio
+1.141 has rounding 0.01, each conversion can introduce up to ±0.004
+error in reference units — enough to accumulate visible discrepancies
+over multiple transactions.
+
+**The Validation:**
+
+The module checks that converting the UoM's rounding step to reference
+units (rounding / factor) does not exceed the reference UoM's rounding.
+This ensures data consistency and prevents precision-related errors.

uom_rounding_coherence/readme/USAGE.md

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+When creating or modifying Units of Measure:
+
+1.  Go to *Inventory \> Configuration \> UoM Categories*
+2.  Create or edit a UoM
+3.  If the rounding precision is too coarse for the conversion ratio,
+    the system will show a validation error
+4.  The error message will indicate:
+    - The UoM with the problem
+    - Its current rounding value
+    - The conversion factor
+    - The effective rounding in reference units
+    - The reference unit and its rounding
+5.  To fix the error, either:
+    - Decrease the rounding of the problematic UoM, or
+    - Increase the rounding of the reference UoM (if appropriate)