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var listItem = myInnovator.newItem("List", "get");
listItem.setProperty("name", "acc_tax_type");
var valueItem = listItem.createRelationship("Value", "get");
valueItem.setProperty("Value", acc_tax_type);
valueItem.setPropertyCondition("Value", "eq");
var resultItem = listItem.apply();
if (resultItem.getItemCount() > 0) {
    var result_rs = resultItem.getItemsByXPath("//Item[@type='Value']");
    acc_tax_type = result_rs.getProperty("label", "null");
    alert(acc_tax_type);
}