@@ -, +, @@ 
 fields can be copied to subfields
 Copy and replace field 001 to 099$a unless 099$a exists
---
 Koha/SimpleMARC.pm                                   |  6 +++---
 .../prog/js/marc_modification_templates.js           | 12 +++++-------
 2 files changed, 8 insertions(+), 10 deletions(-)
--- a/Koha/SimpleMARC.pm	
+++ a/Koha/SimpleMARC.pm	
@@ -135,9 +135,9 @@ sub copy_and_replace_field {
 
     if ( ! ( $record && $fromFieldName && $toFieldName ) ) { return; }
 
-
-    if ( !defined $fromSubfieldName or $fromSubfieldName eq ''
-      or !defined $toSubfieldName or $toSubfieldName eq ''
+    if (
+        ( !defined $fromSubfieldName or $fromSubfieldName eq '' )
+        and ( !defined $toSubfieldName or $toSubfieldName eq '' )
     ) {
         _copy_move_field(
             {   record        => $record,
--- a/koha-tmpl/intranet-tmpl/prog/js/marc_modification_templates.js	
+++ a/koha-tmpl/intranet-tmpl/prog/js/marc_modification_templates.js	
@@ -14,8 +14,11 @@ $(document).ready(function() {
         var action = $("#action").val();
         if ( action == 'move_field' || action == 'copy_field' || action == 'copy_and_replace_field') {
             if ( $("#from_subfield").val().length != $("#to_subfield").val().length ) {
-                alert( __("Both subfield values should be filled or empty.") );
-                return false;
+                if ( ( $("#to_field").val()   >= 10 && $("#to_subfield").val().length   > 0 ) &&
+                     ( $("#from_field").val() >= 10 && $("#from_subfield").val().length > 0 ) ) {
+                    alert( __("Both subfield values should be filled or empty.") );
+                    return false;
+                }
             }
             if ( $("#to_field").val().length <= 0 ) {
                 alert( __("The destination should be filled.") );
@@ -26,11 +29,6 @@ $(document).ready(function() {
                 alert( __("If the field is a control field, the subfield should be empty") );
                 return false;
             }
-            if ( ( $("#from_field").val() < 10 && $("#to_field").val()   >= 10 ) ||
-                 ( $("#to_field").val()   < 10 && $("#from_field").val() >= 10 ) ) {
-                alert( __("A control field cannot be used with a regular field.") );
-                return false;
-            }
         }
         if ( action == 'update_field' ) {
             if ( $("#from_subfield").val().length <= 0 ) {
--