diff --git a/plm/__manifest__.py b/plm/__manifest__.py
index ed4b5f07..76d703d8 100644
--- a/plm/__manifest__.py
+++ b/plm/__manifest__.py
@@ -20,7 +20,7 @@
 ##############################################################################
 {
     "name": "Product Lifecycle Management",
-    "version": "16.0.25",
+    "version": "16.0.26",
     "author": "OmniaSolutions",
     "website": "https://odooplm.omniasolutions.website",
     "category": "Manufacturing/Product Lifecycle Management (PLM)",
diff --git a/plm/controllers/main.py b/plm/controllers/main.py
index 8c324e0a..a416d0c6 100755
--- a/plm/controllers/main.py
+++ b/plm/controllers/main.py
@@ -247,22 +247,24 @@ def get_preview(self, id):
         ir_attachement = request.env['ir.attachment'].sudo()
         for record in ir_attachement.search_read([('id','=', id)], ['preview']):
             return base64.b64decode(record.get('preview'))
-        
+
+
     @route('/plm/ir_attachment_printout/<int:id>', type='http', auth='user', methods=['GET'], csrf=False)
     @webservice
     def get_printout(self, id):
         try:
-            ir_attachement = request.env['ir.attachment'].sudo()
-            for ir_attachement_id in ir_attachement.search_read([('id','=', id)],
-                                                                ['printout','name']):
-                    print_out_data = ir_attachement_id.get('printout')
+            for ir_attachement_id in request.env['ir.attachment'].sudo().browse(id):
+                if ir_attachement_id.printout:
+                    print_out_data = request.env['report.plm.ir_attachment_pdf']._render_qweb_pdf(ir_attachement_id)
+                    print_out_data = print_out_data[0]
                     if print_out_data: 
-                        data = base64.b64decode(print_out_data)
                         headers = [('Content-Type', 'application/pdf'),
-                                   ('Content-Length', len(data)),
-                                   ('Content-Disposition', 'inline; filename="%s"' % ir_attachement_id.get('name','no_name') + '.pdf')]
-                        return request.make_response(data, headers)
+                                   ('Content-Length', len(print_out_data)),
+                                   ('Content-Disposition', f'inline; filename="{ir_attachement_id.engineering_code}_{ir_attachement_id.engineering_revision}.pdf"')]
+                        return request.make_response(print_out_data, headers)
                     else:
-                        return request.not_found("Pdf document %s not Available" % ir_attachement_id.get('name','no_name'))
+                        return request.not_found(f"Pdf document {ir_attachement_id.engineering_code} not Available")
+                else:
+                    return request.not_found(f"Pdf document {ir_attachement_id.engineering_code} not Available")
         except Exception as ex:
             return Response(f"{ex}", status=500)
diff --git a/plm/models/ir_attachment.py b/plm/models/ir_attachment.py
index 69dfbf89..28f75bc9 100755
--- a/plm/models/ir_attachment.py
+++ b/plm/models/ir_attachment.py
@@ -115,9 +115,9 @@ def _compute_must_update_from_cad(self):
         for ir_attachment in self:
             ir_attachment.must_update_from_cad=False
             if ir_attachment.document_type =='2d':
-                ir_attachment.must_update_from_cad=ir_attachment_relation.is_2d_ok(ir_attachment)
-            if ir_attachment.document_type =='pr':
-                ir_attachment.must_update_from_cad=ir_attachment_relation.is_pr_ok(ir_attachment)
+                ir_attachment.must_update_from_cad= not ir_attachment_relation.is_2d_ok(ir_attachment)
+            elif ir_attachment.document_type =='pr':
+                ir_attachment.must_update_from_cad= not ir_attachment_relation.is_pr_ok(ir_attachment)
                 
     def _getPrintoutName(self):
         for ir_attachment_id in self:
@@ -126,7 +126,13 @@ def _getPrintoutName(self):
     def getPrintoutUrl(self):
         self.ensure_one()
         base_url = self.env['ir.config_parameter'].sudo().get_param('web.base.url')
-        return "%s/plm/ir_attachment_printout/%s" % (base_url, self.id) 
+        return f"{base_url}/plm/ir_attachment_printout/{self.id}" 
+    
+    def download_printout(self):
+        return {'type': 'ir.actions.act_url',
+                'url': self.getPrintoutUrl(),
+                'target': 'new',
+                }
 
     @property
     def actions(self):
diff --git a/plm/models/ir_attachment_relations.py b/plm/models/ir_attachment_relations.py
index 265d1b6d..d6f9aa08 100755
--- a/plm/models/ir_attachment_relations.py
+++ b/plm/models/ir_attachment_relations.py
@@ -183,10 +183,10 @@ def is_2d_ok(self, from_ir_attachment_id):
                                             ('link_kind', '=', 'LyTree')
                                         ]):
             if relation_id.parent_id.document_type=='2d' and relation_id.child_id.document_type in ['3d','pr']:
-                if relation_id.parent_id.write_date < relation_id.child_id.write_date:
+                if relation_id.parent_id.getLastCadSave() < relation_id.child_id.getLastCadSave():
                     return False
             if relation_id.child_id.document_type=='2d' and relation_id.parent_id.document_type in ['3d','pr'] :
-                if relation_id.child_id.write_date<relation_id.parent_id.write_date:
+                if relation_id.child_id.getLastCadSave()<relation_id.parent_id.getLastCadSave():
                     return False
         return True                
 
diff --git a/plm/models/plm_mixin.py b/plm/models/plm_mixin.py
index 24a184c0..3d78f201 100644
--- a/plm/models/plm_mixin.py
+++ b/plm/models/plm_mixin.py
@@ -177,7 +177,29 @@ def action_from_confirmed_to_released(self):
             obj.engineering_state = RELEASED_STATUS
             obj._mark_worklow_user_date()
             obj._mark_obsolete_previous()
-    
+
+    def action_un_release(self):
+        if not self.env.user.has_group("plm.group_plm_admin_unrelease"):
+            raise UserError("You are not allowed to perform such an action ask to your PLM admin")
+        for obj in self:
+            body ="""
+                FORCE draft action from super plm admin user !!!
+                data could be not as expected !!!
+            """
+            obj.message_post(body=body)
+            obj.with_context(check=False).engineering_state=START_STATUS
+        
+    def action_un_release_release(self):
+        if not self.env.user.has_group("plm.group_plm_admin_unrelease"):
+            raise UserError("You are not allowed to perform such an action ask to your PLM admin")
+        for obj in self:
+            body ="""
+                FORCE release action from super plm admin user !!!
+                data could be not as expected !!!
+            """
+            obj.message_post(body=body)
+            obj.with_context(check=False).engineering_state=RELEASED_STATUS
+            
     def _mark_obsolare(self):
         for obj in self:
             obj.engineering_state = OBSOLATED_STATUS
@@ -187,7 +209,7 @@ def _mark_under_modifie(self):
         for obj in self:
             obj.engineering_state = UNDER_MODIFY_STATUS
             obj._mark_worklow_user_date()
-                
+            
     def _mark_under_modifie_previous(self):
         for obj in self:
             if obj.engineering_revision in [False, 0]:
diff --git a/plm/models/product_product.py b/plm/models/product_product.py
index d67505da..5bd59442 100755
--- a/plm/models/product_product.py
+++ b/plm/models/product_product.py
@@ -871,7 +871,7 @@ def action_reactivate(self):
             product_product_id.commonWFAction(RELEASED_STATUS,
                                               [OBSOLATED_STATUS])
         return True
-
+        
     def commonWFAction(self,
                        status,
                        include_statuses=[],
diff --git a/plm/security/base_plm_security.xml b/plm/security/base_plm_security.xml
index 4a334c24..34ab7b48 100755
--- a/plm/security/base_plm_security.xml
+++ b/plm/security/base_plm_security.xml
@@ -25,7 +25,14 @@
         <field name="implied_ids" eval="[(4, ref('group_plm_integration_user'))]"/>
         <field name="users" eval="[(4, ref('base.user_root')), (4, ref('base.user_admin'))]"/>
     </record>
-    
+
+    <!-- Un release user  -->
+    <record id="group_plm_admin_unrelease" model="res.groups">
+        <field name="name">Unrelease User</field>
+        <field name="category_id" ref="odooplm_module_category"/>
+        <field name="implied_ids" eval="[(4, ref('group_plm_admin'))]"/>
+    </record>
+
     <!-- Readonly Released  -->
     <record id="group_plm_readonly_released" model="res.groups">
         <field name="name">PLM Integration Readonly</field>
diff --git a/plm/views/ir_attachment_view.xml b/plm/views/ir_attachment_view.xml
index 4b5e0b95..1d0a0ea0 100755
--- a/plm/views/ir_attachment_view.xml
+++ b/plm/views/ir_attachment_view.xml
@@ -57,6 +57,18 @@
                             string="Confirm Document"
                             class="oe_highlight"
                             attrs="{'invisible': ['|',('is_checkout','=',True),('engineering_state','!=','draft')]}"/>
+                    <button name="action_un_release"
+                            type="object"
+                            attrs="{'invisible': [('engineering_state','!=','released')]}"
+                            string="Un Release"
+                            groups="plm.group_plm_admin_unrelease"
+                            class="oe_highlight"/>
+                    <button name="action_un_release_release"
+                            type="object"
+                            attrs="{'invisible': [('engineering_state','!=','draft')]}"
+                            string="Re Release"
+                            groups="plm.group_plm_admin_unrelease"
+                            class="oe_highlight"/>
                     <field name="engineering_state"
                            widget="statusbar"
                            statusbar_visible="draft,confirmed,released"
@@ -224,10 +236,13 @@
                   decoration-success="engineering_state == 'released'"
                   decoration-warning="engineering_state == 'undermodify'"
                   decoration-muted="engineering_state == 'obsoleted'">
-
-                <field name="preview" widget="image" options="{ 'size': [60, 60]}"/>
-                <field name="printout_name" invisible="True"/>
-                <field name="printout" widget="binary" filename="printout_name" readonly="True"/>
+                <field name="document_type" invisible="True"/>
+                <field name="preview" widget="image" options="{ 'size': [60, 60]}"/>                
+                <button
+                    class="fa fa-print"
+                    type="object"
+                    name="download_printout"
+                    attrs="{'invisible':[('document_type','in',['3d','pr','other'])]}"/>
                 <field name="name" select="True"/>
                 <field name="engineering_revision" select="True"/>
                 <field name="engineering_state" select="True"/>