Index: uc_vat.module
===================================================================
--- uc_vat.module	(revision 746)
+++ uc_vat.module	(working copy)
@@ -58,7 +58,25 @@ function uc_vat_uc_price_handler() {
  * Implementation of hook_theme_registry_alter().
  */
 function uc_vat_theme_registry_alter(&$registry) {
-  $registry['cart_review_table']['function'] = 'theme_uc_vat_cart_review_table';
+  $registry['cart_review_table']['function'] = 'uc_vat_cart_review_table';
+}
+
+/**
+ * Theme registry callback override for
+ */
+function uc_vat_cart_review_table($show_subtotal = TRUE) {
+  return theme('uc_vat_cart_review_table', $show_subtotal);
+}
+
+/**
+ * Implementation of hook_theme().
+ */
+function uc_vat_theme($existing, $type, $theme, $path) {
+  return array(
+    'uc_vat_cart_review_table' => array(
+      'arguments' => array('show_subtotal' => TRUE),
+    )
+  );
 }
 
 /**