Owner must have these permissions as Knowledge Pad is a parent of a Knowledge Box.

bt5/erp5_knowledge_pad/WorkflowTemplateItem/portal_workflow/knowledge_pad_validation_workflow/states/visible.xml

@@ -62,6 +62,7 @@
                         <string>Assignor</string>
                         <string>Auditor</string>
                         <string>Manager</string>
+                        <string>Owner</string>
                       </tuple>
                     </value>
                 </item>
@@ -71,6 +72,7 @@
                       <tuple>
                         <string>Assignor</string>
                         <string>Manager</string>
+                        <string>Owner</string>
                       </tuple>
                     </value>
                 </item>
@@ -80,6 +82,7 @@
                       <tuple>
                         <string>Assignor</string>
                         <string>Manager</string>
+                        <string>Owner</string>
                       </tuple>
                     </value>
                 </item>
@@ -89,6 +92,7 @@
                       <tuple>
                         <string>Assignor</string>
                         <string>Manager</string>
+                        <string>Owner</string>
                       </tuple>
                     </value>
                 </item>
@@ -99,6 +103,7 @@
                         <string>Assignor</string>
                         <string>Auditor</string>
                         <string>Manager</string>
+                        <string>Owner</string>
                       </tuple>
                     </value>
                 </item>

bt5/erp5_knowledge_pad/bt/revision

-732
\ No newline at end of file
+733
\ No newline at end of file