The intent is to update the TargetUpdateType property of a QueryDefinition object using SSJS. (reference)
The following SSJS is outputting an error response to the QueryDefinition.Update() function:
<script language="javascript" runat="server">
Platform.Load("core", "1");
var QD_TestAudienceSend_ExternalKey = "qd-testaudiencesend";
var qd = QueryDefinition.Init(QD_TestAudienceSend_ExternalKey);
var update_status = qd.Update({TargetUpdateType: "update"});
</script>
update_status: <ctrl:var name=update_status />
Any ideas what I'm doing wrong?