fix: new docs should refetch incoming rates (backport #58097) (#58295)

Co-authored-by: Mihir Kandoi <kandoimihir@gmail.com>

erpnext/controllers/selling_controller.py

@@ -573,12 +573,12 @@ class SellingController(StockController):
 					reset_incoming_rate()
 
 				if (
-					not d.incoming_rate
+					(not d.incoming_rate or self.is_new())
+					and not is_standalone
 					or self.is_internal_transfer()
 					or (
 						get_valuation_method(d.item_code, self.company) == "Moving Average"
 						and self.get("is_return")
-						and not is_standalone
 					)
 				):
 					d.incoming_rate = get_incoming_rate(