[IMP] task_id readonly if method_type import

attachment_synchronize/demo/attachment_synchronize_task_demo.xml

@@ -17,4 +17,11 @@
         <field name="emails">foo@example.org,bar@example.org</field>
     </record>
 
+    <record id="attachment_queue_imported_demo" model="attachment.queue">
+        <field name="datas">bWlncmF0aW9uIHRlc3Q=</field>
+        <field name="datas_fname">attachment_queue_imported_demo.doc</field>
+        <field name="name">attachment_queue_imported_demo.doc</field>
+        <field name="task_id" ref="import_from_filestore" />
+    </record>
+
 </odoo>

attachment_synchronize/models/attachment_queue.py

@@ -9,6 +9,7 @@ class AttachmentQueue(models.Model):
     _inherit = "attachment.queue"
 
     task_id = fields.Many2one("attachment.synchronize.task", string="Task")
+    method_type = fields.Selection(related="task_id.method_type")
     storage_backend_id = fields.Many2one(
         "storage.backend",
         string="Storage Backend",

attachment_synchronize/views/attachment_queue_views.xml

@@ -5,10 +5,16 @@
         <field name="model">attachment.queue</field>
         <field name="inherit_id" ref="attachment_queue.view_attachment_queue_form" />
         <field name="arch" type="xml">
-            <field name="url" position="after">
-                <field name="task_id" attrs="{'required': [('file_type', '=', 'export')]}"/>
+            <!-- Add Related Task and Backend -->
+            <xpath expr="//field[@name='url']" position="after">
+                <field name="method_type" invisible="1"/>
+                <field
+                    name="task_id"
+                    domain="[('method_type', '!=', 'import')]"
+                    attrs="{'required': [('file_type', '=', 'export')], 'readonly': [('method_type', '=', 'import')]}"
+                />
                 <field name="storage_backend_id"/>
-            </field>
+            </xpath>
         </field>
     </record>