diff --git a/redfish-core/include/error_messages.hpp b/redfish-core/include/error_messages.hpp
index 0243be9..9a2d1ca 100644
--- a/redfish-core/include/error_messages.hpp
+++ b/redfish-core/include/error_messages.hpp
@@ -787,6 +787,20 @@
 void invalidUpload(crow::Response& res, const std::string& arg1,
                    const std::string& arg2);
 
+/**
+ * @brief Formats MutualExclusiveProperties message into JSON
+ * Message body: "The properties <arg1> and <arg2> are mutually exclusive."
+ *
+ * @param[in] arg1 Parameter of message that will replace %1 in its body.
+ * @param[in] arg2 Parameter of message that will replace %2 in its body.
+ *
+ * @returns Message MutualExclusiveProperties formatted to JSON */
+nlohmann::json mutualExclusiveProperties(const std::string& arg1,
+                                         const std::string& arg2);
+
+void mutualExclusiveProperties(crow::Response& res, const std::string& arg1,
+                               const std::string& arg2);
+
 } // namespace messages
 
 } // namespace redfish
diff --git a/redfish-core/include/registries/base_message_registry.hpp b/redfish-core/include/registries/base_message_registry.hpp
index 90aef56..7c385a0 100644
--- a/redfish-core/include/registries/base_message_registry.hpp
+++ b/redfish-core/include/registries/base_message_registry.hpp
@@ -36,7 +36,7 @@
 constexpr const char* url =
     "https://redfish.dmtf.org/registries/Base.1.8.1.json";
 
-constexpr std::array<MessageEntry, 73> registry = {
+constexpr std::array<MessageEntry, 74> registry = {
     MessageEntry{
         "AccessDenied",
         {
@@ -429,6 +429,22 @@
             "Resolve other reported errors and retry the current operation.",
         }},
     MessageEntry{
+        "MutualExclusiveProperties",
+        {
+            "Indicates that the requested operation could not be completed, "
+            "because of a conflict properties.",
+            "The properties '%1' and '%2' are mutually exclusive.",
+            "Warning",
+            "Warning",
+            2,
+            {
+                "string",
+                "string",
+            },
+            "Ensure that the request body doesn't have mutually exclusive "
+            "properties and resubmit the request.",
+        }},
+    MessageEntry{
         "NoOperation",
         {
             "Indicates that the requested operation will not perform any "
diff --git a/redfish-core/lib/event_service.hpp b/redfish-core/lib/event_service.hpp
index e1c06ec..f7b76d1 100644
--- a/redfish-core/lib/event_service.hpp
+++ b/redfish-core/lib/event_service.hpp
@@ -250,6 +250,16 @@
             return;
         }
 
+        if (regPrefixes && msgIds)
+        {
+            if (regPrefixes->size() && msgIds->size())
+            {
+                messages::mutualExclusiveProperties(
+                    asyncResp->res, "RegistryPrefixes", "MessageIds");
+                return;
+            }
+        }
+
         // Validate the URL using regex expression
         // Format: <protocol>://<host>:<port>/<uri>
         // protocol: http/https
diff --git a/redfish-core/src/error_messages.cpp b/redfish-core/src/error_messages.cpp
index 160b73f..c6938ba 100644
--- a/redfish-core/src/error_messages.cpp
+++ b/redfish-core/src/error_messages.cpp
@@ -1750,6 +1750,35 @@
         {"Resolution", "None."}};
 }
 
+/**
+ * @internal
+ * @brief Formats MutualExclusiveProperties into JSON
+ *
+ * See header file for more information
+ * @endinternal
+ */
+nlohmann::json mutualExclusiveProperties(const std::string& arg1,
+                                         const std::string& arg2)
+{
+    return nlohmann::json{
+        {"@odata.type", "#Message.v1_0_0.Message"},
+        {"MessageId", "Base.1.5.0.MutualExclusiveProperties"},
+        {"Message", "The properties " + arg1 + " and " + arg2 +
+                        " are mutually exclusive."},
+        {"MessageArgs", {arg1, arg2}},
+        {"Severity", "Warning"},
+        {"Resolution",
+         "Ensure that the request body doesn't contain mutually exclusive "
+         "properties and resubmit the request."}};
+}
+
+void mutualExclusiveProperties(crow::Response& res, const std::string& arg1,
+                               const std::string& arg2)
+{
+    res.result(boost::beast::http::status::bad_request);
+    addMessageToErrorJson(res.jsonValue, mutualExclusiveProperties(arg1, arg2));
+}
+
 } // namespace messages
 
 } // namespace redfish