Confirm purch order using x++ d365FO

 PurchFormLetter purchFormLetter;

 PurchTable      purchTable;

purchTable = PurchTable::find(_purchId);

if (purchTable != null)

{    

    ttsbegin;

    purchFormLetter = PurchFormLetter::construct(DocumentStatus::PurchaseOrder);

 purchFormLetter.update( purchTable,purchTable.PurchId,DateTimeUtil::getSystemDate(DateTimeUtil::getCompanyTimeZone()),PurchUpdate::All,AccountOrder::None, false, false, false);

    ttscommit;

}