var $trans_type; // invoice, order, delivery note ...
var $trans_no = array();// array (num1=>ver1,..) or 0 for new
var $so_type = 0; // for sales order: simple=0 template=1
var $trans_type; // invoice, order, delivery note ...
var $trans_no = array();// array (num1=>ver1,..) or 0 for new
var $so_type = 0; // for sales order: simple=0 template=1