Index: MsgDefs.h
===================================================================
diff -u -r4997b2ccddf764b2789e7469685926a1def4195d -r43bcdbff752f578fe33ff30ec5cf912454a1b685
--- MsgDefs.h	(.../MsgDefs.h)	(revision 4997b2ccddf764b2789e7469685926a1def4195d)
+++ MsgDefs.h	(.../MsgDefs.h)	(revision 43bcdbff752f578fe33ff30ec5cf912454a1b685)
@@ -107,6 +107,8 @@
     MSG_ID_HD_HEPARIN_PAUSE_RESUME_RESPONSE = 0x4C,                     ///< HD response to pause/resume Heparing delivery request
     MSG_ID_HD_HEPARIN_DATA_BROADCAST = 0x4D,                            ///< HD broadcast of Heparin delivery data
     MSG_ID_UI_SET_ALARM_AUDIO_VOLUME_LEVEL_CMD = 0x4E,                  ///< UI command to set alarm audio volume level
+    MSG_ID_UI_SET_UF_VOLUME_PARAMETER = 0x4F,                           ///< UI request to validate new ultrafiltration volume treatment parameter
+    MSG_ID_HD_SET_UF_VOLUME_PARAMETER_RESPONSE = 0x50,                  ///< HD response to new treatment parameters set
 
 #ifdef EMC_TEST_BUILD
     MSG_ID_CAN_ERROR_COUNT = 0x999,  // test code in support of EMC testing
@@ -227,6 +229,8 @@
 
     MSG_ID_HD_DEBUG_EVENT = 0xFFF1,                                     ///< HD debug event text to be logged in event log
     MSG_ID_DG_DEBUG_EVENT = 0xFFF2,                                     ///< DG debug event text to be logged in event log
+
+    MSG_ID_ACK_MESSAGE_THAT_REQUIRES_ACK = 0xFFFF,                      ///< Acknowledgment of message that requires acknowledgment
 
     END_OF_MSG_IDS                                                      ///< End of system message IDs
 };