Index: SDDs/CreateRx.puml
===================================================================
diff -u -re16be85f53cf630e993a43fa6ccca56355201b18 -rfeb708952ab1311368560d025d1e241c68b5413c
--- SDDs/CreateRx.puml	(.../CreateRx.puml)	(revision e16be85f53cf630e993a43fa6ccca56355201b18)
+++ SDDs/CreateRx.puml	(.../CreateRx.puml)	(revision feb708952ab1311368560d025d1e241c68b5413c)
@@ -48,27 +48,49 @@
         UI ->o Wait_Retry: ⟲: Create Rx Screen
         US -> UI: ENT: Patient ID Text
         US -> UI: TCH: Touch each parameter to set value
-        alt Confirm
-            US -> UI: TCH: Confirm Button
+        alt Validate
+            US -> UI: TCH: Validate Button
             UI -> SW: ACT: Prescription Parameters
             SW -> TD: MSG: [x3F: #(all the Rx Params)] Req \n Prescription Parameters: Validation
+            alt Accepted
+                TD -> SW: MSG: [x40: 1,X] Rsp \n Prescription Parameters: Validation
+                SW -> UI: ACT: Notify UI: Parameters validation \n\t(Generate QR Code)
+                UI -> UI: ACT: Lock all editable fields\n\tShow QR Code\n\tShow Confirm Button
+                alt Confirm
+                    US -> UI: TCH: Confirm Button
+                    UI -> SW: ACT: Prescription Parameters Confimation
+                    SW -> TD: MSD: [x44: 1] Req \n Prescription Parameters Confimation
+                    alt Accepted
+                        TD -> SW: MSG: [x12: 4,1] Dat \n OpMode - Pre-Treatment
+                        SW -> UI: CMD: Pre-Treatment Stack
+                        UI -[#Green]>o Pre_Tx
+                    end
+                end
+            else #Pink
+                TD -> SW: MSG: [x40: 0,#RR] Rsp \n Prescription Parameters: Validation
+                SW -> UI: CMD: Highlight Rejected Parameters
+                UI ->o Wait_Retry: ⟲: Prescription Parameters Screen
+            end
         end
-        alt Accepted
-            TD -> SW: MSG: [x40: 1,X] Rsp \n Prescription Parameters: Validation
-            SW -> UI: ACT: Notify UI: Parameters validation \n\t(Generate QR Code)
-            UI -> SW: ACT: Prescription Parameters Confimation
-            SW -> TD: MSD: [x44: 1] Req \n Prescription Parameters Confimation
-            TD -> SW: MSG: [x12: 4,1] Dat \n OpMode - Pre-Treatment
-            SW -> UI: CMD: Pre-Treatment Stack
-            UI -[#Green]>o Pre_Tx
-        else #Pink
-            TD -> SW: MSG: [x40: 0,#RR] Rsp \n Prescription Parameters: Validation
-            SW -> UI: CMD: Highlight Rejected Parameters
-            UI ->o Wait_Retry: ⟲: Prescription Parameters Screen
-        end
     else #Pink Rejected x46: Initiate Treatment
         TD -> SW: MSG: [x46: 0,RR]
         SW -> UI: CMD: Rejection Reason (RR) Notification
         UI ->o Wait_Retry: ⟲: MainHome Screen
     end
+    alt Back
+        US -> UI: TCH: Back Button
+        UI -> SW: ACT: Back
+        alt Is Validated?
+            SW -> TD: MSG: [x44: 0] Req \n Prescription Parameters Confirmations: Back
+            SW -> UI: ACT: Set to not validated
+            UI -> UI: ACT: Enable Fields
+            UI ->o Wait_Retry: ⟲: Create Rx Screen
+        else
+            UI -> UI: ACT: Clear Create Rx Screen
+            SW -> TD: MSG: [x45: 0] Req \n Initiate Treatment Cancel
+            TD -> SW: MSG: [x12: 3,1] Dat \n OpMode - Standby
+            SW -> UI: CMD: MainHome Screen
+            UI ->o Wait_Retry: ⟲: MainHome Screen
+        end
+    end
 @enduml