I have a PO that I am receiving against. I want to receive part of the line that exists as well as add a new line.

The existing line is received as expected. However, when I try to add the new line, it creates a line with the item code and unit cost that I specify, but the ordered quantity does not take.

I've tried changing the order that I create/receive the lines. The only hint I've found online is in PO Receipt of Goods Received Quantity not writing, but unlike the user there, I call nCopyPurchaseOrderLines once before I add the new line. I've duplicated my work within Sage and don't see any popups I need to handle or extra fields I need to set.

Does anyone have any ideas? Examples or documentation on the subject I can read?

PO: https://imgbox.com/o5NOv5xb

Resultant receipt: https://imgbox.com/4XwuX4Kb

SageResponse response;
int r;
object[] receiptNo = new object[] { string.Empty };
string retValue = string.Empty;

using (DispatchObject oScript = new DispatchObject("ProvideX.Script", _sys_ss.SageServer)) {
	oScript.InvokeMethod("Init", _sys_ss.SageInstall);
	using (DispatchObject oSession = new DispatchObject(oScript.InvokeMethod("NewObject", "SY_Session"))) {
		if ((int)oSession.InvokeMethod("nSetUser", _sys_ss.UserLogon, _sys_ss.Password) == 1) {
			if ((int)oSession.InvokeMethod("nSetCompany", _sys_ss.CompanyCode) == 1) {
				r = (int)oSession.InvokeMethod("nSetModule", "P/O");
				r = (int)oSession.InvokeMethod("nSetDate", "P/O", DateTime.Now.ToString("yyyyMMdd"));
				int TaskID = (int)oSession.InvokeMethod("nLookupTask", "PO_ReceiptOfGoods_UI");
				if (TaskID != 0) {
					oSession.InvokeMethod("nSetProgram", TaskID);
					using (DispatchObject oBusObj = new DispatchObject(oScript.InvokeMethod("NewObject", "PO_Receipt_BUS", oSession.GetObject()))) {
						r = (int)oBusObj.InvokeMethod("nSelectBatch", string.Empty);

						r = (int)oBusObj.InvokeMethod("nSetKeyValue", "ReceiptType$", "G");

						r = (int)oBusObj.InvokeMethodByRef("nGetNextReceiptNo", receiptNo);
						r = (int)oBusObj.InvokeMethod("nSetKeyValue", "ReceiptNo$", receiptNo[0].ToString() ?? string.Empty);

						r = (int)oBusObj.InvokeMethod("nSetKey");
						r = (int)oBusObj.InvokeMethod("nSetValue", "ReceiptDate$", "20230808");
						r = (int)oBusObj.InvokeMethod("nSetValue", "PurchaseOrderNo$", "137C");
						r = (int)oBusObj.InvokeMethod("nCopyPurchaseOrderLines", 0);

						using (DispatchObject oLines = new DispatchObject(oBusObj.GetProperty("oLines"))) {
							#region Existing item
							r = (int)oLines.InvokeMethod("nMoveFirst");
							while ((int)oLines.InvokeMethod("nEOF") != 1) {
								object[] parameters = new object[] { "ItemCode$", "" };
								r = (int)oLines.InvokeMethodByRef("nGetValue", parameters);
								string itemCode = (string)parameters[1];
								if (itemCode == "79") {
									r = (int)oLines.InvokeMethod("nSetValue", "QuantityReceived", 390.96);
									r = (int)oLines.InvokeMethod("nWrite");
								}//if
								r = (int)oLines.InvokeMethod("nMoveNext");
							}//while
							#endregion

							#region New item
							r = (int)oLines.InvokeMethod("nAddLine");
							r = (int)oLines.InvokeMethod("nSetValue", "ItemCode$", "DOCK");
							r = (int)oLines.InvokeMethod("nSetValue", "OriginalQtyOrdered", 390.96);
							r = (int)oLines.InvokeMethod("nSetValue", "UnitCost", -19.95);
							r = (int)oLines.InvokeMethod("nWrite");
							#endregion
						}//using

						r = (int)oBusObj.InvokeMethod("nWrite");
					}//using
				} else
					retValue = $"Invalid UI (PO_ReceiptOfGoods_UI)";
			} else
				retValue = "Invalid Company";
		} else
			retValue = "Invalid User Logon or Password";
	}//using
}//using