Add test for ask_orderbook validation

freqtrade/configuration/config_validation.py

@@ -193,7 +193,7 @@ def _validate_ask_orderbook(conf: Dict[str, Any]) -> None:
     ask_strategy = conf.get('ask_strategy', {})
     ob_min = ask_strategy.get('order_book_min')
     ob_max = ask_strategy.get('order_book_max')
-    if ob_min is not None and ob_max is not None:
+    if ob_min is not None and ob_max is not None and ask_strategy.get('use_order_book'):
         if ob_min != ob_max:
             raise OperationalException(
                 "Using order_book_max != order_book_min in ask_strategy is no longer supported."

freqtrade/exchange/exchange.py

@@ -1071,8 +1071,8 @@ class Exchange:
                 rate = order_book[f"{ask_strategy['price_side']}s"][order_book_top - 1][0]
             except (IndexError, KeyError) as e:
                 logger.warning(
-                    "Sell Price at location from orderbook could not be determined."
-                    f"Orderbook: {order_book}"
+                    f"Sell Price at location {order_book_top} from orderbook could not be "
+                    f"determined. Orderbook: {order_book}"
                 )
                 raise PricingError from e
         else: