diff --git a/ipc/CommandMessage.cpp b/ipc/CommandMessage.cpp
index 8c296abd..cc1185c7 100644
--- a/ipc/CommandMessage.cpp
+++ b/ipc/CommandMessage.cpp
@@ -88,6 +88,7 @@ void CommandMessage::setToUnknownCommand() {
 
 void CommandMessage::setReplyRejected(ReturnValue_t reason,
         Command_t initialCommand) {
+	setCommand(REPLY_REJECTED);
     setParameter(reason);
     setParameter2(initialCommand);
 }
diff --git a/parameters/ParameterHelper.cpp b/parameters/ParameterHelper.cpp
index e40ed675..53f1229f 100644
--- a/parameters/ParameterHelper.cpp
+++ b/parameters/ParameterHelper.cpp
@@ -26,7 +26,6 @@ ReturnValue_t ParameterHelper::handleParameterMessage(CommandMessage *message) {
 	}
 		break;
 	case ParameterMessage::CMD_PARAMETER_LOAD: {
-
 		uint8_t domain = HasParametersIF::getDomain(
 				ParameterMessage::getParameterId(message));
 		uint16_t parameterId = HasParametersIF::getMatrixId(
@@ -34,12 +33,14 @@ ReturnValue_t ParameterHelper::handleParameterMessage(CommandMessage *message) {
 		uint8_t index = HasParametersIF::getIndex(
 				ParameterMessage::getParameterId(message));
 
-		const uint8_t *storedStream;
-		size_t storedStreamSize;
+		const uint8_t *storedStream = nullptr;
+		size_t storedStreamSize = 0;
 		result = storage->getData(
 				ParameterMessage::getStoreId(message), &storedStream,
 				&storedStreamSize);
 		if (result != HasReturnvaluesIF::RETURN_OK) {
+			sif::error << "ParameterHelper::handleParameterMessage: Getting"
+					" store data failed for load command." << std::endl;
 			break;
 		}
 
diff --git a/parameters/ParameterHelper.h b/parameters/ParameterHelper.h
index 352cf0a9..538aaac6 100644
--- a/parameters/ParameterHelper.h
+++ b/parameters/ParameterHelper.h
@@ -5,6 +5,12 @@
 #include <framework/parameters/ParameterMessage.h>
 #include <framework/parameters/ReceivesParameterMessagesIF.h>
 
+/**
+ * @brief	Helper class to handle parameter messages
+ * @details
+ * This class simplfiies handling of parameter messages, which are sent
+ * to a class which implements ReceivesParameterMessagesIF.
+ */
 class ParameterHelper {
 public:
 	ParameterHelper(ReceivesParameterMessagesIF *owner);
diff --git a/tmtcservices/CommandingServiceBase.cpp b/tmtcservices/CommandingServiceBase.cpp
index 4c9b5375..330fd00f 100644
--- a/tmtcservices/CommandingServiceBase.cpp
+++ b/tmtcservices/CommandingServiceBase.cpp
@@ -126,11 +126,11 @@ void CommandingServiceBase::handleCommandMessage(CommandMessage* reply) {
 			&nextCommand, iter->objectId, &isStep);
 
 	/* If the child implementation does not implement special handling for
-	 * rejected replies (RETURN_FAILED is returned), a failure verification
-	 * will be generated with the reason as the return code and the initial
-	 * command as failure parameter 1 */
-	if(reply->getCommand() == CommandMessage::REPLY_REJECTED and
-			result == RETURN_FAILED) {
+	 * rejected replies (RETURN_FAILED or INVALID_REPLY is returned), a
+	 * failure verification will be generated with the reason as the
+	 * return code and the initial command as failure parameter 1 */
+	if((reply->getCommand() == CommandMessage::REPLY_REJECTED) and
+			(result == RETURN_FAILED or result == INVALID_REPLY)) {
 	    result = reply->getReplyRejectedReason();
 	    failureParameter1 = iter->command;
 	}
@@ -230,8 +230,8 @@ void CommandingServiceBase::handleRequestQueue() {
 		address = message.getStorageId();
 		packet.setStoreAddress(address);
 
-		if (packet.getSubService() == 0
-				or isValidSubservice(packet.getSubService()) != RETURN_OK) {
+		if ((packet.getSubService() == 0)
+				or (isValidSubservice(packet.getSubService()) != RETURN_OK)) {
 			rejectPacket(TC_VERIFY::START_FAILURE, &packet, INVALID_SUBSERVICE);
 			continue;
 		}
diff --git a/tmtcservices/CommandingServiceBase.h b/tmtcservices/CommandingServiceBase.h
index 1bd18571..b3a15985 100644
--- a/tmtcservices/CommandingServiceBase.h
+++ b/tmtcservices/CommandingServiceBase.h
@@ -87,7 +87,7 @@ public:
 	 * @param opCode is unused here at the moment
 	 * @return RETURN_OK
 	 */
-	virtual ReturnValue_t performOperation(uint8_t opCode);
+	virtual ReturnValue_t performOperation(uint8_t opCode) override;
 
 	virtual uint16_t getIdentifier();
 
@@ -116,7 +116,7 @@ public:
 	 * Used to setup the reference of the task, that executes this component
 	 * @param task Pointer to the taskIF of this task
 	 */
-	virtual void setTaskIF(PeriodicTaskIF* task);
+	virtual void setTaskIF(PeriodicTaskIF* task) override;
 
 protected:
 	/**
@@ -173,9 +173,7 @@ protected:
 	 * This function is implemented by child services to specify how replies
 	 * to a command from another software component are handled.
 	 * @param reply
-	 * This is the reply which can be accessed via the command message
-	 * interface. The internal message pointer can be passed to different
-	 * command message implementations (see CommandMessageIF)
+	 * This is the reply in form of a generic read-only command message.
 	 * @param previousCommand
 	 * Command_t of related command
 	 * @param state [out/in]
@@ -189,10 +187,11 @@ protected:
 	 * - @c RETURN_OK, @c EXECUTION_COMPLETE or @c NO_STEP_MESSAGE to
 	 *   generate TC verification success
 	 * - @c INVALID_REPLY Calls handleUnrequestedReply
-	 * - Anything else triggers a TC verification failure. If RETURN_FAILED
-	 *   is returned and the command ID is CommandMessage::REPLY_REJECTED,
-	 *   a failure verification message with the reason as the error parameter
-	 *   and the initial command as failure parameter 1.
+	 * - Anything else triggers a TC verification failure. If RETURN_FAILED or
+	 * 	 INVALID_REPLY is returned and the command ID is
+	 * 	 CommandMessage::REPLY_REJECTED, a failure verification message with
+	 * 	 the reason as the error parameter and the initial command as
+	 * 	 failure parameter 1 is generated.
 	 */
 	virtual ReturnValue_t handleReply(const CommandMessage* reply,
 			Command_t previousCommand, uint32_t *state,