Index: MsgDefs.h
===================================================================
diff -u -rbe2ccf4c93a0ae7f3ac85d2d98000caccfc69d70 -r5e5378064b7d047c4257c003ca4ba681f560ccac
--- MsgDefs.h	(.../MsgDefs.h)	(revision be2ccf4c93a0ae7f3ac85d2d98000caccfc69d70)
+++ MsgDefs.h	(.../MsgDefs.h)	(revision 5e5378064b7d047c4257c003ca4ba681f560ccac)
@@ -8,8 +8,8 @@
 *
 * @file    MsgDefs.h
 *
-* @author  (last)      Dara Navaei
-* @date    (last)      11-Jan-2023
+* @author  (last)      Sean Nash
+* @date    (last)      12-Jan-2023
 *
 * @author  (original)  Sean
 * @date    (original)  27-Feb-2020
@@ -538,6 +538,7 @@
     REQUEST_REJECT_REASON_HD_SERVICE_IS_DUE = 48,                       ///< HD service is due
     REQUEST_REJECT_REASON_DG_CHEM_FLUSH_NOT_COMPLETED = 49,             ///< DG chemical flush is not complete
     REQUEST_REJECT_REASON_DG_RO_FILTER_TEMPERATURE_OUT_OF_RANGE = 50,   ///< DG RO filter temperature out of range
+    REQUEST_REJECT_REASON_DG_INCOMPATIBLE = 51,                         ///< DG firmware version is not compatible with HD firmware
     NUM_OF_REQUEST_REJECT_REASONS                                       ///< Number of settings change reject codes
 };
 typedef enum Request_Reject_Reasons REQUEST_REJECT_REASON_CODE_T;       ///< Type for settings change rejection reason codes enumeration