Dropship Purchase Order has Receive Button instead of Mark Shipped Button

I have a requirement to create purchase order from sales order in net suite through c# code.

code i have used to create purchase order:

  var createPurchaseOrder = new PurchaseOrder();
  createPurchaseOrder.entity = new RecordRef()
   {
  internalId = "653",
  name = "Auto"
   //type = RecordType.purchaseOrder,
   //typeSpecified = true 
   };
   RecordRef soRecordRef = new RecordRef();
  soRecordRef.internalId = soInternalId;
  soRecordRef.type = RecordType.salesOrder;
  soRecordRef.typeSpecified = true;
  createPurchaseOrder.createdFrom = soRecordRef;
   RecordRef cFormRecordRef = new RecordRef();
  cFormRecordRef.internalId = "106";
  createPurchaseOrder.customForm = cFormRecordRef;
   RecordRef depRecordRef = new RecordRef();
  depRecordRef.internalId = "15";
  depRecordRef.name = "01-Cash";
  depRecordRef.type = RecordType.department;
  depRecordRef.typeSpecified = true;
  createPurchaseOrder.department = depRecordRef;
   RecordRef locRecordRef = new RecordRef();
  locRecordRef.internalId = "1";
  locRecordRef.name = "2439";
  locRecordRef.type = RecordType.location;
  locRecordRef.typeSpecified