diff --git a/DESCRIPTION b/DESCRIPTION
index 229e615..aa3560c 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: rib
 Title: An Implementation of 'Interactive Brokers' API
-Version: 0.23.0
+Version: 0.23.1
 Authors@R: person("Luca", "Billi", email = "noreply.section+dev@gmail.com", role = c("aut", "cre"))
 Description: Allows interaction with 'Interactive Brokers' 'Trader Workstation'
     <https://interactivebrokers.github.io/tws-api/>.
diff --git a/R/Decoder.R b/R/Decoder.R
index 420974a..83f6a2c 100644
--- a/R/Decoder.R
+++ b/R/Decoder.R
@@ -398,6 +398,10 @@ Decoder <- R6Class("Decoder",
       if(ver >= MIN_SERVER_VER_INCLUDE_OVERNIGHT)
         order$includeOvernight <- imsg$pop()
 
+      if(ver >= MIN_SERVER_VER_CME_TAGGING_FIELDS_IN_OPEN_ORDER)
+        order[c("extOperator",
+                "manualOrderIndicator")] <- imsg$pop(2L)
+
       private$validate("openOrder", orderId=    order$orderId,
                                     contract=   contract,
                                     order=      order,
diff --git a/R/constants.R b/R/constants.R
index 37cff65..d8d8b35 100644
--- a/R/constants.R
+++ b/R/constants.R
@@ -23,7 +23,8 @@ MIN_SERVER_VER_INCLUDE_OVERNIGHT                  <- 189L
 MIN_SERVER_VER_UNDO_RFQ_FIELDS                    <- 190L
 MIN_SERVER_VER_PERM_ID_AS_LONG                    <- 191L
 MIN_SERVER_VER_CME_TAGGING_FIELDS                 <- 192L
+MIN_SERVER_VER_CME_TAGGING_FIELDS_IN_OPEN_ORDER   <- 193L
 
 
 MIN_CLIENT_VER <- 176L
-MAX_CLIENT_VER <- MIN_SERVER_VER_CME_TAGGING_FIELDS
+MAX_CLIENT_VER <- MIN_SERVER_VER_CME_TAGGING_FIELDS_IN_OPEN_ORDER