[18.0][ADD] rma_batch_reason: add new module to link batch and reason behaviors

rma_batch_reason/README.rst

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+================
+RMA Batch Reason
+================
+
+.. 
+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+   !! This file is generated by oca-gen-addon-readme !!
+   !! changes will be overwritten.                   !!
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+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+.. |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-OCA%2Frma-lightgray.png?logo=github
+    :target: https://github.com/OCA/rma/tree/18.0/rma_batch_reason
+    :alt: OCA/rma
+.. |badge4| image:: https://img.shields.io/badge/weblate-Translate%20me-F47D42.png
+    :target: https://translation.odoo-community.org/projects/rma-18-0/rma-18-0-rma_batch_reason
+    :alt: Translate me on Weblate
+.. |badge5| image:: https://img.shields.io/badge/runboat-Try%20me-875A7B.png
+    :target: https://runboat.odoo-community.org/builds?repo=OCA/rma&target_branch=18.0
+    :alt: Try me on Runboat
+
+|badge1| |badge2| |badge3| |badge4| |badge5|
+
+Managing return reasons at the batch level.
+
+This addon extends the RMA Batch functionality by introducing a reason
+field that can be set at the batch level. When a reason is assigned:
+
+- All RMAs within that batch automatically inherit the batch's reason
+- Individual RMAs can override the batch reason if needed
+
+**Table of contents**
+
+.. contents::
+   :local:
+
+Usage
+=====
+
+To use this module:
+
+1. Go to RMA > RMA Batches
+2. Create or open an RMA Batch
+3. In the form, locate the "Reason" field (added after the Operation
+   field)
+4. Select a reason from the dropdown
+5. The reason will automatically be applied to all RMAs
+6. Individual RMAs can override the batch reason by setting their own
+   reason
+
+Bug Tracker
+===========
+
+Bugs are tracked on `GitHub Issues <https://github.com/OCA/rma/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/OCA/rma/issues/new?body=module:%20rma_batch_reason%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
+-------
+
+* ACSONE SA/NV
+
+Contributors
+------------
+
+- Stéphane Mangin - ACSONE SA/NV stephane.mangin@acsone.eu
+
+Maintainers
+-----------
+
+This module is maintained by the OCA.
+
+.. image:: https://odoo-community.org/logo.png
+   :alt: Odoo Community Association
+   :target: https://odoo-community.org
+
+OCA, or the Odoo Community Association, is a nonprofit organization whose
+mission is to support the collaborative development of Odoo features and
+promote its widespread use.
+
+This module is part of the `OCA/rma <https://github.com/OCA/rma/tree/18.0/rma_batch_reason>`_ project on GitHub.
+
+You are welcome to contribute. To learn how please visit https://odoo-community.org/page/Contribute.

rma_batch_reason/__init__.py

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+from . import models

rma_batch_reason/__manifest__.py

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+# Copyright 2026 ACSONE SA/NV
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+{
+    "name": "RMA Batch Reason",
+    "summary": """Add reason field to RMA batches and propagate to RMAs""",
+    "version": "18.0.1.0.0",
+    "license": "AGPL-3",
+    "website": "https://github.com/OCA/rma",
+    "author": "ACSONE SA/NV, Odoo Community Association (OCA)",
+    "depends": [
+        "rma_batch",
+        "rma_reason",
+    ],
+    "data": [
+        "views/rma_batch.xml",
+    ],
+    "installable": True,
+}

rma_batch_reason/models/__init__.py

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+from . import rma_batch
+from . import rma

rma_batch_reason/models/rma.py

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+# Copyright 2026 ACSONE SA/NV
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+from odoo import api, models
+
+
+class Rma(models.Model):
+    _inherit = "rma"
+
+    @api.model_create_multi
+    def create(self, vals_list):
+        for vals in vals_list:
+            if vals.get("batch_id") and not vals.get("reason_id"):
+                batch = self.env["rma.batch"].browse(vals["batch_id"])
+                if batch.reason_id:
+                    vals["reason_id"] = batch.reason_id.id
+        return super().create(vals_list)

rma_batch_reason/models/rma_batch.py

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+# Copyright 2026 ACSONE SA/NV
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+from odoo import api, fields, models
+
+
+class RmaBatch(models.Model):
+    _inherit = "rma.batch"
+
+    reason_id = fields.Many2one(
+        "rma.reason",
+        string="Reason",
+        help="Reason for the return, applied to all RMAs in the batch.",
+    )
+
+    @api.onchange("reason_id")
+    def _onchange_reason_id(self):
+        for rec in self:
+            if rec.state != "draft":
+                continue
+            if rec.reason_id:
+                rec.rma_ids.filtered(
+                    lambda r: not r.reason_id
+                ).reason_id = rec.reason_id

rma_batch_reason/pyproject.toml

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

rma_batch_reason/readme/CONTRIBUTORS.md

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+- Stéphane Mangin - ACSONE SA/NV <stephane.mangin@acsone.eu>
+

rma_batch_reason/readme/DESCRIPTION.md

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+Managing return reasons at the batch level.
+
+This addon extends the RMA Batch functionality by introducing a reason field that
+can be set at the batch level. When a reason is assigned:
+
+- All RMAs within that batch automatically inherit the batch's reason
+- Individual RMAs can override the batch reason if needed
+

rma_batch_reason/readme/USAGE.md

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+To use this module:
+
+1. Go to RMA > RMA Batches
+2. Create or open an RMA Batch
+3. In the form, locate the "Reason" field (added after the Operation field)
+4. Select a reason from the dropdown
+5. The reason will automatically be applied to all RMAs
+7. Individual RMAs can override the batch reason by setting their own reason
+