Add oca-purchase submodule with 96 purchase modules moved from oca-workflow-process

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

odoo-bringout-oca-purchase-workflow-purchase_discount/purchase_discount/report/__init__.py

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+from . import purchase_report

odoo-bringout-oca-purchase-workflow-purchase_discount/purchase_discount/report/purchase_report.py

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+# Copyright 2017 Akretion (Alexis de Lattre <alexis.delattre@akretion.com>)
+# Copyright 2017-2019 Tecnativa - Pedro M. Baeza
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import fields, models
+
+
+class PurchaseReport(models.Model):
+    _inherit = "purchase.report"
+
+    discount = fields.Float(
+        string="Discount (%)", digits="Discount", group_operator="avg"
+    )
+
+    def _select(self):
+        res = super()._select()
+        # There are 3 matches
+        res = res.replace("l.price_unit", self._get_discounted_price_unit_exp())
+        res += ", l.discount AS discount"
+        return res
+
+    def _group_by(self):
+        res = super()._group_by()
+        res += ", l.discount"
+        return res
+
+    def _get_discounted_price_unit_exp(self):
+        """Inheritable method for getting the SQL expression used for
+        calculating the unit price with discount(s).
+
+        :rtype: str
+        :return: SQL expression for discounted unit price.
+        """
+        return "(1.0 - COALESCE(l.discount, 0.0) / 100.0) * l.price_unit"