fix: add is_new in if condition

(cherry picked from commit 4dcac56486)

erpnext/accounts/doctype/pricing_rule/utils.py

@@ -691,7 +691,9 @@ def apply_pricing_rule_for_free_items(doc, pricing_rule_args):
 				args.pop((item.item_code, item.pricing_rules))
 
 		for free_item in args.values():
-			if frappe.get_value("Pricing Rule", free_item["pricing_rules"], "enforce_free_item_qty"):
+			if doc.is_new() or frappe.get_value(
+				"Pricing Rule", free_item["pricing_rules"], "enforce_free_item_qty"
+			):
 				doc.append("items", free_item)