Create Purchase Order_and_Invoice in ax 2012

static void Dev_CreatePO_and_Invoice(Args _args)
{
NumberSeq numberSeq;
Purchtable Purchtable;
PurchLine PurchLine;
PurchFormLetter purchFormLetter;
;
ttsbegin;
numberSeq = NumberSeq::newGetNumFromCode(purchParameters::numRefPurchaseOrderId().NumberSequence,true);
// Initialize Purchase order values
Purchtable.initValue();
Purchtable.PurchId = numberSeq.num();
Purchtable.OrderAccount = '3000';
Purchtable.initFromVendTable();
if (!Purchtable.validateWrite())
{
throw Exception::Error;
}
Purchtable.insert();
// Initialize Purchase Line items
PurchLine.PurchId = Purchtable.PurchId;
PurchLine.ItemId = 'B-R14';
PurchLine.createLine(true, true, true, true, true, false);
ttscommit;
purchFormLetter = purchFormLetter::construct(DocumentStatus::Invoice);
purchFormLetter.update(purchtable, // Purchase record Buffer
"Inv_"+purchTable.PurchId, // Invoice Number
systemdateget()); // Transaction date
if (PurchTable::find(purchTable.PurchId).DocumentStatus == DocumentStatus::Invoice)
{
info(strfmt("Posted invoiced journal for purchase order %1",purchTable.PurchId));
}
}