diff --git a/addons/project/models/project.py b/addons/project/models/project.py
index a2a17937ff4..b645f7fa867 100644
--- a/addons/project/models/project.py
+++ b/addons/project/models/project.py
@@ -373,7 +373,7 @@ class Task(models.Model):
     partner_id = fields.Many2one('res.partner',
         string='Customer',
         default=_get_default_partner)
-    manager_id = fields.Many2one('res.users', string='Project Manager', related='project_id.user_id')
+    manager_id = fields.Many2one('res.users', string='Project Manager', related='project_id.user_id', readonly=True)
     company_id = fields.Many2one('res.company',
         string='Company',
         default=lambda self: self.env['res.company']._company_default_get())
@@ -382,9 +382,9 @@ class Task(models.Model):
     attachment_ids = fields.One2many('ir.attachment', 'res_id', domain=lambda self: [('res_model', '=', self._name)], auto_join=True, string='Attachments')
     # In the domain of displayed_image_id, we couln't use attachment_ids because a one2many is represented as a list of commands so we used res_model & res_id
     displayed_image_id = fields.Many2one('ir.attachment', domain="[('res_model', '=', 'project.task'), ('res_id', '=', id), ('mimetype', 'ilike', 'image')]", string='Displayed Image')
-    legend_blocked = fields.Char(related='stage_id.legend_blocked', string='Kanban Blocked Explanation')
-    legend_done = fields.Char(related='stage_id.legend_done', string='Kanban Valid Explanation')
-    legend_normal = fields.Char(related='stage_id.legend_normal', string='Kanban Ongoing Explanation')
+    legend_blocked = fields.Char(related='stage_id.legend_blocked', string='Kanban Blocked Explanation', readonly=True)
+    legend_done = fields.Char(related='stage_id.legend_done', string='Kanban Valid Explanation', readonly=True)
+    legend_normal = fields.Char(related='stage_id.legend_normal', string='Kanban Ongoing Explanation', readonly=True)
 
     @api.onchange('project_id')
     def _onchange_project(self):
diff --git a/addons/project_issue/models/project_issue.py b/addons/project_issue/models/project_issue.py
index ebfa3377e4b..66bed3ea24e 100644
--- a/addons/project_issue/models/project_issue.py
+++ b/addons/project_issue/models/project_issue.py
@@ -60,9 +60,9 @@ class ProjectIssue(models.Model):
     user_email = fields.Char(related='user_id.email', string='User Email', readonly=True)
     date_action_last = fields.Datetime(string='Last Action', readonly=True)
     date_action_next = fields.Datetime(string='Next Action', readonly=True)
-    legend_blocked = fields.Char(related="stage_id.legend_blocked", string='Kanban Blocked Explanation')
-    legend_done = fields.Char(related="stage_id.legend_done", string='Kanban Valid Explanation')
-    legend_normal = fields.Char(related="stage_id.legend_normal", string='Kanban Ongoing Explanation')
+    legend_blocked = fields.Char(related="stage_id.legend_blocked", string='Kanban Blocked Explanation', readonly=True)
+    legend_done = fields.Char(related="stage_id.legend_done", string='Kanban Valid Explanation', readonly=True)
+    legend_normal = fields.Char(related="stage_id.legend_normal", string='Kanban Ongoing Explanation', readonly=True)
 
     @api.multi
     def _read_group_stage_ids(self, domain, read_group_order=None, access_rights_uid=None):