Added a new case for =duplicate

acqui.simple/addbiblio.pl

@@ -485,6 +485,14 @@ if ($op eq "addbiblio") {
 #------------------------------------------------------------------------------------------------------------------------------
 } else {
 #------------------------------------------------------------------------------------------------------------------------------
+	# If we're in a duplication case, we have to set to "" the bibid and biblionumber
+	# as we'll save the biblio as a new one.
+	if ($op eq "duplicate")
+	{
+		$bibid = "";
+		$oldbiblionumber= "";
+	}
+
 	build_tabs ($template, $record, $dbh,$encoding);
 	build_hidden_data;
 	$template->param(