diff --git a/APPL/Shared/kenmerk_js.asp b/APPL/Shared/kenmerk_js.asp
index b9405468d1..b881492352 100644
--- a/APPL/Shared/kenmerk_js.asp
+++ b/APPL/Shared/kenmerk_js.asp
@@ -372,6 +372,10 @@ function callback_flex_expr_info(json)
     // save  initial visibility state of field
     var initialVisible = $("#" + json[kenmerk].kfieldid + "val").is(":visible");
 
+    // Fill the attribute "default" if it isn't defined yet. The parameter "json[kenmerk].waarde" contains the current/correct value for new and existing calls.
+    if ($("#" + json[kenmerk].kfieldid + "val").attr("default") == undefined)
+      $("#" + json[kenmerk].kfieldid + "val").attr("default", json[kenmerk].waarde);
+
     if ($("#" + json[kenmerk].kfieldid + "val").hasClass("flexshow") ||
         $("#Suggest" + json[kenmerk].kfieldid + "_show").hasClass("flexshow") ||
         (["L", "X"].indexOf(json[kenmerk].kenmerktype) > -1 && $("label[for=" + json[kenmerk].kfieldid + "val]").hasClass("flexshow")) ||
@@ -428,7 +432,8 @@ function callback_flex_expr_info(json)
       var $fld_show = $("#Suggest" + json[kenmerk].kfieldid + "_show");
 
 
-      if (json[kenmerk].exprwaarde == 0 || json[kenmerk].exprwaarde == null) {
+      if (json[kenmerk].exprwaarde == 0 || json[kenmerk].exprwaarde == null)
+      {
         // save default value in flex field
         if (initialVisible)
         {