[ADD] purchase_packaging_uom: Added module.

purchase_packaging_uom/README.rst

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+# purchase_packaging_uom
+
+This is the README for purchase_packaging_uom.

purchase_packaging_uom/__init__.py

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+from . import models

purchase_packaging_uom/__manifest__.py

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+# Copyright 2020 Camptocamp SA
+# Copyright 2020 ForgeFlow, S.L.
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl)
+{
+    "name": "Purchase Packaging UoM",
+    "summary": "Adds purchase uom to product packaging",
+    "version": "16.0.1.0.0",
+    "category": "Purchase",
+    "website": "https://github.com/OCA/purchase-workflow",
+    "author": "Ametras, Odoo Community Association (OCA)",
+    "license": "AGPL-3",
+    "application": False,
+    "installable": True,
+    "depends": ["product"],
+    "data": ["views/product_packaging.xml"],
+}

purchase_packaging_uom/models/__init__.py

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+from . import product_packaging

purchase_packaging_uom/models/product_packaging.py

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+# Copyright 2021 Ametras
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl)
+from odoo import fields, models
+
+
+class ProductPackaging(models.Model):
+    _inherit = "product.packaging"
+
+    product_uom_po_id = fields.Many2one(
+        "uom.uom",
+        related="product_id.uom_po_id",
+        readonly=True,
+    )