Index: openacs-4/packages/invoices/lib/invoice-items-list-portlet.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/invoices/lib/invoice-items-list-portlet.tcl,v
diff -u -r1.1 -r1.2
--- openacs-4/packages/invoices/lib/invoice-items-list-portlet.tcl	2 Nov 2005 23:11:04 -0000	1.1
+++ openacs-4/packages/invoices/lib/invoice-items-list-portlet.tcl	3 Nov 2005 22:49:12 -0000	1.2
@@ -1 +1,9 @@
+set required_param_list [list portlet_title]
+
+foreach required_param $required_param_list {
+    if {![info exists $required_param]} {
+	return -code error "<b>$required_param is a required parameter.</b>"
+    }
+}
+
 set portlet_layout [parameter::get -parameter "DefaultPortletLayout"]
\ No newline at end of file