[UPD] purchase_requisition_custom: retrieve department from purchase requst to purchase order

odex25_purchase/purchase_requisition_custom/__manifest__.py

@@ -14,6 +14,7 @@
         'data/purchase_sequence.xml',
         'data/purchase_request_seq.xml',
         'data/cron_data.xml',
+        'data/server_actions.xml',
         'views/purchase_requisition_custom.xml',
         'views/purchase_request.xml',
         'views/res_setting.xml',

odex25_purchase/purchase_requisition_custom/data/server_actions.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+
+    <record id="action_compute_department_purchase_order" model="ir.actions.server">
+        <field name="name">Compute Department for Purchase Orders</field>
+        <field name="model_id" ref="base.model_ir_actions_server"/>
+        <field name="state">code</field>
+        <field name="code">env['purchase.order']._recompute_all_department_id()</field>
+    </record>
+
+</odoo>

odex25_purchase/purchase_requisition_custom/models/purchase_order.py

@@ -83,7 +83,7 @@ class PurchaseOrderCustom(models.Model):
         ('cancel', 'Cancelled'),
         ('budget_rejected', 'Rejected By Budget'),
         ('wait_for_send', 'Waiting For Send to Budget')], default='wait')
-    department_id = fields.Many2one('hr.department')
+    department_id = fields.Many2one('hr.department', compute="_compute_department_id", store=True, readonly=False)
     purpose = fields.Char()
     category_ids = fields.Many2many('product.category', string='Categories')
     committe_members = fields.One2many('committe.member', inverse_name='po_id')
@@ -120,6 +120,17 @@ class PurchaseOrderCustom(models.Model):
     is_signed = fields.Boolean()
     budget_id = fields.Many2one('crossovered.budget')
     already_voted = fields.Boolean(compute="_compute_already_voted")
+
+
+    @api.depends('request_id')
+    def _compute_department_id(self):
+        for rec in self:
+            rec.department_id = rec.request_id.department_id
+    
+    def _recompute_all_department_id(self):
+        for rec in self.sudo().search([('request_id', '!=', False), ('department_id', '=', False)]):
+            rec._compute_department_id()
+    
     def get_attachments(self):
         # Check if multiple records are passed, and handle them in a loop
         if len(self) > 1:
@@ -188,7 +199,6 @@ class PurchaseOrderCustom(models.Model):
 
         return action
 
-
     def _prepare_invoice(self):
         res = super(PurchaseOrderCustom, self)._prepare_invoice()
         res.update({'purchase_id': self.id, 'res_id': self.id,'res_model': 'purchase.order'})