diff --git a/templates/design40_webpages/ir/form_header.html b/templates/design40_webpages/ir/form_header.html
index dc0ffecdbf..010e57b177 100644
--- a/templates/design40_webpages/ir/form_header.html
+++ b/templates/design40_webpages/ir/form_header.html
@@ -105,7 +105,7 @@ <h1>[% title %]</h1>
     [% END %]
     <tr>
       <th>[% 'Record in' | $T8 %]</th>
-      <td>[% P.chart.picker("AP_chart_id", AP_chart_id, class="wi-wide", type="AP") %]</td>
+      <td>[% P.chart.picker("AP_chart_id", AP_chart_id, class="wi-wide", type="AP", "data-validate"="required") %]</td>
     </tr>
     <tr>
       <th>[% 'Steuersatz' | $T8 %]</th>
diff --git a/templates/design40_webpages/is/form_header.html b/templates/design40_webpages/is/form_header.html
index e6c3d2d7d7..a5bca3bc37 100644
--- a/templates/design40_webpages/is/form_header.html
+++ b/templates/design40_webpages/is/form_header.html
@@ -144,7 +144,7 @@ <h1>[% title %]</h1>
     [% END %]
     <tr>
       <th>[% 'Record in' | $T8 %]</th>
-      <td>[% P.chart.picker("AR_chart_id", AR_chart_id, class="wi-wide", type="AR") %]</td>
+      <td>[% P.chart.picker("AR_chart_id", AR_chart_id, class="wi-wide", type="AR", "data-validate"="required") %]</td>
     </tr>
     [% IF currencies %]
       <tr>
diff --git a/templates/webpages/ir/form_header.html b/templates/webpages/ir/form_header.html
index 3a6156a39c..57ae0f068d 100644
--- a/templates/webpages/ir/form_header.html
+++ b/templates/webpages/ir/form_header.html
@@ -97,7 +97,7 @@ <h1>[% title %]</h1>
 [%- END %]
         <tr>
           <th align="right" nowrap>[% 'Record in' | $T8 %]</th>
-          <td colspan="3">[% P.chart.picker("AP_chart_id", AP_chart_id, style="width:250px;", type="AP") %]</td>
+          <td colspan="3">[% P.chart.picker("AP_chart_id", AP_chart_id, style="width:250px;", type="AP", "data-validate"="required") %]</td>
         </tr>
         <tr>
           <th align="right">[% 'Steuersatz' | $T8 %]</th>
diff --git a/templates/webpages/is/form_header.html b/templates/webpages/is/form_header.html
index c47db6392e..fec26ae93e 100644
--- a/templates/webpages/is/form_header.html
+++ b/templates/webpages/is/form_header.html
@@ -143,7 +143,7 @@ <h1>[% title %]</h1>
         <tr>
           <th align="right" nowrap>[% 'Record in' | $T8 %]</th>
           <td colspan="3">
-            [% P.chart.picker("AR_chart_id", AR_chart_id, style="width:259px;", type="AR") %]
+            [% P.chart.picker("AR_chart_id", AR_chart_id, style="width:259px;", type="AR", "data-validate"="required") %]
           </td>
         </tr>
         <tr>