fix(patch): add patch to set packed_qty in draft DN

(cherry picked from commit 196e181)

erpnext/patches.txt

@@ -331,3 +331,4 @@ execute:frappe.db.set_single_value("Accounts Settings", "merge_similar_account_h
 # below migration patches should always run last
 erpnext.patches.v14_0.migrate_gl_to_payment_ledger
 erpnext.patches.v14_0.update_company_in_ldc
+erpnext.patches.v14_0.set_packed_qty_in_draft_delivery_notes

erpnext/patches/v14_0/set_packed_qty_in_draft_delivery_notes.py

@@ -0,0 +1,60 @@
+# Copyright (c) 2023, Frappe Technologies Pvt. Ltd. and contributors
+# For license information, please see license.txt
+
+import frappe
+from frappe.query_builder.functions import Sum
+
+
+def execute():
+	ps = frappe.qb.DocType("Packing Slip")
+	dn = frappe.qb.DocType("Delivery Note")
+	ps_item = frappe.qb.DocType("Packing Slip Item")
+
+	ps_details = (
+		frappe.qb.from_(ps)
+		.join(ps_item)
+		.on(ps.name == ps_item.parent)
+		.join(dn)
+		.on(ps.delivery_note == dn.name)
+		.select(
+			dn.name.as_("delivery_note"),
+			ps_item.item_code.as_("item_code"),
+			Sum(ps_item.qty).as_("packed_qty"),
+		)
+		.where((ps.docstatus == 1) & (dn.docstatus == 0))
+		.groupby(dn.name, ps_item.item_code)
+	).run(as_dict=True)
+
+	if ps_details:
+		dn_list = set()
+		item_code_list = set()
+		for ps_detail in ps_details:
+			dn_list.add(ps_detail.delivery_note)
+			item_code_list.add(ps_detail.item_code)
+
+		dn_item = frappe.qb.DocType("Delivery Note Item")
+		dn_item_query = (
+			frappe.qb.from_(dn_item)
+			.select(
+				dn.parent.as_("delivery_note"),
+				dn_item.name,
+				dn_item.item_code,
+				dn_item.qty,
+			)
+			.where((dn_item.parent.isin(dn_list)) & (dn_item.item_code.isin(item_code_list)))
+		)
+
+		dn_details = frappe._dict()
+		for r in dn_item_query.run(as_dict=True):
+			dn_details.setdefault((r.delivery_note, r.item_code), frappe._dict()).setdefault(r.name, r.qty)
+
+		for ps_detail in ps_details:
+			dn_items = dn_details.get((ps_detail.delivery_note, ps_detail.item_code))
+
+			if dn_items:
+				remaining_qty = ps_detail.packed_qty
+				for name, qty in dn_items.items():
+					if remaining_qty > 0:
+						row_packed_qty = min(qty, remaining_qty)
+						frappe.db.set_value("Delivery Note Item", name, "packed_qty", row_packed_qty)
+						remaining_qty -= row_packed_qty