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-supplier_calendar/supplier_calendar/models/stock_rule.py

@@ -0,0 +1,24 @@
+# Copyright 2020 ForgeFlow S.L.
+# License LGPL-3.0 or later (https://www.gnu.org/licenses/lgpl.html)
+
+from dateutil.relativedelta import relativedelta
+
+from odoo import fields, models
+
+
+class StockRule(models.Model):
+    _inherit = "stock.rule"
+
+    def _prepare_purchase_order(self, company_id, origins, values):
+        res = super()._prepare_purchase_order(company_id, origins, values)
+        dates = [fields.Datetime.from_string(value["date_planned"]) for value in values]
+        values = values[0]
+        partner = values["supplier"].partner_id
+        procurement_date_planned = min(dates)
+        schedule_date = procurement_date_planned - relativedelta(
+            days=company_id.po_lead
+        )
+        delay = -1 * values["supplier"].delay
+        purchase_date = partner.supplier_plan_days(schedule_date, delay)
+        res["date_order"] = purchase_date
+        return res