create Purchase order and invoice programmatically using x++ code

Following Job creates the Purchase order from code and post the invoice by making use of PurchFormLetter class.
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));
}
}
__
Change the documentstatus to packingSlip , if you want to post packing slip.
Enjoy ....Invoicing through Code.