diff --git a/circ/checkout-notes.pl b/circ/checkout-notes.pl
index 9f5e1c7bdf..0d3a80f4c0 100755
--- a/circ/checkout-notes.pl
+++ b/circ/checkout-notes.pl
@@ -36,20 +36,16 @@ my ( $template, $loggedinuser, $cookie ) = get_template_and_user(
     }
 );
 
-my $action;
-foreach (qw( seen notseen )) {
-    $action = $_ if ( $query->param("mark_selected-$_") );
-}
-$action ||= 'none';
+my $op = $query->param("op") || 'none';
 
 my @issue_ids = $query->multi_param('issue_ids');
 
-if ( $action eq 'seen' ) {
+if ( $op eq 'cud-seen' ) {
     foreach my $issue_id ( @issue_ids ) {
         my $issue = Koha::Checkouts->find($issue_id);
         $issue->set({ noteseen => 1 })->store;
                                 }
-} elsif ( $action eq 'notseen' ) {
+} elsif ( $op eq 'cud-notseen' ) {
     foreach my $issue_id ( @issue_ids ) {
         my $issue = Koha::Checkouts->find($issue_id);
         $issue->set({ noteseen => 0 })->store;
@@ -59,7 +55,7 @@ if ( $action eq 'seen' ) {
 my $notes = Koha::Checkouts->search({ 'me.note' => { '!=', undef } }, { prefetch => [ 'patron', { item => 'biblionumber' } ] });
 $template->param(
     selected_count => scalar(@issue_ids),
-    action         => $action,
+    op             => $op,
     notes          => $notes,
 );
 
diff --git a/koha-tmpl/intranet-tmpl/prog/en/modules/circ/checkout-notes.tt b/koha-tmpl/intranet-tmpl/prog/en/modules/circ/checkout-notes.tt
index 8003a17ee6..86f486f2ae 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/modules/circ/checkout-notes.tt
+++ b/koha-tmpl/intranet-tmpl/prog/en/modules/circ/checkout-notes.tt
@@ -50,9 +50,9 @@
 
             [% IF ( selected_count ) %]
                 <div class="dialog message">
-                    [% IF ( action == 'seen' ) %]
+                    [% IF ( op == 'cud-seen' ) %]
                         <span>[% selected_count | html %] note(s) marked as seen.</span>
-                    [% ELSIF ( action == 'notseen' ) %]
+                    [% ELSIF ( op == 'cud-notseen' ) %]
                         <span>[% selected_count | html %] note(s) marked as not seen.</span>
                     [% ELSE %]
                         <span>Failed to change the status of [% selected_count | html %] item(s).</span>
@@ -64,8 +64,8 @@
                 <form id="mark_selected" method="post" action="/cgi-bin/koha/circ/checkout-notes.pl">
                     [% INCLUDE 'csrf-token.inc' %]
                     <div id="toolbar" class="btn-toolbar">
-                        <button type="submit" class="btn btn-default markseen" name="mark_selected-seen" value="seen" disabled="disabled"><i class="fa-solid fa-eye"></i> Mark seen</button>
-                        <button type="submit" class="btn btn-default markseen" name="mark_selected-notseen" value="notseen" disabled="disabled"><i class="fa-solid fa-eye-slash"></i> Mark not seen</button>
+                        <button type="submit" class="btn btn-default markseen" name="op" value="cud-seen" disabled="disabled"><i class="fa-solid fa-eye"></i> Mark seen</button>
+                        <button type="submit" class="btn btn-default markseen" name="op" value="cud-notseen" disabled="disabled"><i class="fa-solid fa-eye-slash"></i> Mark not seen</button>
                     </div>
 
                     <div class="btn-toolbar selections-toolbar">
@@ -181,10 +181,10 @@
 
             $("#notestable").on("click", "button.seen, button.notseen", function(event){
                 event.preventDefault(); // prevent form submission
-                var $action = $(this).attr("name");
+                var $op = $(this).attr("name");
                 var $issue_id = $(this).data('issue_id');
                 var ajaxData = {
-                    'action': $action,
+                    'op': $op,
                     'issue_id': $issue_id,
                 };
 
@@ -197,7 +197,7 @@
 
                 .done(function(data){
                     if (data.status == 'success'){
-                        if ( $action == 'notseen' ){
+                        if ( $op == 'notseen' ){
                             $("#status_" + $issue_id).text(_("Not seen"));
                             $(event.target).parent().siblings(".seen1").removeClass("seen1").addClass("seen0");
                             $(event.target).siblings(".seen").prop("disabled", false);
diff --git a/svc/checkout_notes b/svc/checkout_notes
index c9443dba10..6b656d7db4 100755
--- a/svc/checkout_notes
+++ b/svc/checkout_notes
@@ -44,14 +44,14 @@ if ( $auth_status ne "ok" ) {
 if ($is_ajax) {
     my $issue_id = $query->param('issue_id');
     my $issue = Koha::Checkouts->find($issue_id);
-    my $action = $query->param('action');
+    my $op = $query->param('op');
     my $status = 'success';
-    if ($action eq 'seen'){
+    if ($op eq 'seen'){
         $issue->set({ noteseen => 1 })->store;
         if ( $issue->noteseen != 1 ) {
             $status = 'failure';
         }
-    } elsif ($action eq 'notseen'){
+    } elsif ($op eq 'notseen'){
         $issue->set({ noteseen => 0 })->store;
         if ( $issue->noteseen != 0 ) {
             $status = 'failure';