Improving the management of planned orders:

* Add menu entry for planned orders
  * Add button to navigate from planned orders to linked manufacturing orders
  * Add action to convert planned orders to fixed
  * When changing the due date in a planned order the release date is recomputed

mrp_multi_level/models/mrp_planned_order.py

@@ -1,8 +1,9 @@
 # Copyright 2019 ForgeFlow S.L. (https://www.forgeflow.com)
 # - Lois Rilo Antelo <lois.rilo@forgeflow.com>
 # License LGPL-3.0 or later (https://www.gnu.org/licenses/lgpl.html).
+from datetime import timedelta
 
-from odoo import fields, models
+from odoo import api, fields, models
 
 
 class MrpPlannedOrder(models.Model):
@@ -70,3 +71,38 @@ class MrpPlannedOrder(models.Model):
         comodel_name="mrp.inventory",
         ondelete="set null",
     )
+    mrp_production_ids = fields.One2many(
+        "mrp.production", "planned_order_id", string="Manufacturing Orders"
+    )
+    mo_count = fields.Integer(compute="_compute_mrp_production_count")
+
+    def _compute_mrp_production_count(self):
+        for rec in self:
+            rec.mo_count = len(rec.mrp_production_ids)
+
+    @api.onchange("due_date")
+    def _onchange_due_date(self):
+        if self.due_date:
+            if self.product_mrp_area_id.mrp_lead_time:
+                calendar = self.mrp_area_id.calendar_id
+                if calendar:
+                    dt = fields.Datetime.from_string(self.due_date)
+                    res = calendar.plan_days(
+                        -1 * (self.product_mrp_area_id.mrp_lead_time + 1), dt
+                    )
+                    self.order_release_date = res.date()
+                else:
+                    self.order_release_date = fields.Date.from_string(
+                        self.due_date
+                    ) - timedelta(days=self.product_mrp_area_id.mrp_lead_time)
+
+    def action_toggle_fixed(self):
+        for rec in self:
+            rec.fixed = not rec.fixed
+
+    def action_open_linked_mrp_production(self):
+        action = self.env.ref("mrp.mrp_production_action")
+        result = action.read()[0]
+        result["context"] = {}
+        result["domain"] = "[('id','in',%s)]" % self.mrp_production_ids.ids
+        return result