fix: update sql function usage syntax

erpnext/accounts/general_ledger.py

@@ -766,7 +766,7 @@ def validate_against_pcv(is_opening, posting_date, company):
 		)
 
 	last_pcv_date = frappe.db.get_value(
-		"Period Closing Voucher", {"docstatus": 1, "company": company}, "max(period_end_date)"
+		"Period Closing Voucher", {"docstatus": 1, "company": company}, {"MAX": "period_end_date"}
 	)
 
 	if last_pcv_date and getdate(posting_date) <= getdate(last_pcv_date):

erpnext/stock/doctype/packing_slip/packing_slip.py

@@ -5,7 +5,7 @@
 import frappe
 from frappe import _
 from frappe.utils import cint, flt
-
+from frappe.query_builder.functions import Sum
 from erpnext.controllers.status_updater import StatusUpdater
 
 
@@ -128,11 +128,11 @@ class PackingSlip(StatusUpdater):
 						item.idx
 					)
 				)
-
+			DocType = frappe.qb.DocType("Delivery Note Item" if item.dn_detail else "Packed Item")
 			remaining_qty = frappe.db.get_value(
 				"Delivery Note Item" if item.dn_detail else "Packed Item",
 				{"name": item.dn_detail or item.pi_detail, "docstatus": 0},
-				["sum(qty - packed_qty)"],
+				Sum(DocType.qty - DocType.packed_qty),
 			)
 
 			if remaining_qty is None:
@@ -174,7 +174,7 @@ class PackingSlip(StatusUpdater):
 		return (
 			cint(
 				frappe.db.get_value(
-					"Packing Slip", {"delivery_note": self.delivery_note, "docstatus": 1}, ["max(to_case_no)"]
+					"Packing Slip", {"delivery_note": self.delivery_note, "docstatus": 1}, {"MAX": "to_case_no"}
 				)
 			)
 			+ 1