- add support for field 'can_review' to hide the approve/reject buttons

- add possibility to restart the validation at any point in time during the
approval process.

oca_dependencies.txt

@@ -1,2 +1,3 @@
 server-tools
-purchase-workflow
+purchase-workflow
+server-ux https://github.com/Eficent/server-ux 11.0-base_tier_validation-can_review

purchase_tier_validation/views/purchase_order_view.xml

@@ -15,7 +15,7 @@
                     type="object"/>
                 <button name="restart_validation"
                     string="Restart Validation"
-                    attrs="{'invisible': ['|','|',('review_ids', '=', []),('rejected','=',False),('state','not in',['draft','sent'])]}"
+                    attrs="{'invisible': ['|',('review_ids', '=', []),('state','not in',['draft','sent'])]}"
                     type="object"/>
             </button>
             <header position="after">
@@ -29,17 +29,19 @@
                      style="margin-bottom:0px;">
                     <p><i class="fa fa-info-circle"/>This PO needs to be
                         validated.
+                        <field name="can_review" invisible="1"/>
                         <button name="validate_tier"
-                            string="Validate"
-                            attrs="{'invisible': [('review_ids', '=', [])]}"
-                            type="object"
-                            class="oe_inline oe_button btn-success"
-                            icon="fa-thumbs-up"/>
+                                string="Validate"
+                                attrs="{'invisible': [('can_review', '=', False)]}"
+                                type="object"
+                                class="oe_inline oe_button btn-success"
+                                icon="fa-thumbs-up"/>
                         <button name="reject_tier"
-                            string="Reject"
-                            type="object"
-                            class="btn-icon btn-danger"
-                            icon="fa-thumbs-down"/>
+                                string="Reject"
+                                attrs="{'invisible': [('can_review', '=', False)]}"
+                                type="object"
+                                class="btn-icon btn-danger"
+                                icon="fa-thumbs-down"/>
                     </p>
                 </div>
                 <div class="alert alert-success"