diff --git a/months.cls b/months.cls
index fbf3496..330a7f4 100644
--- a/months.cls
+++ b/months.cls
@@ -21,6 +21,7 @@ Private vedit As String
 Private adjust() As Object
 Private jtext() As Variant
 Private basejson As Object
+Private rollback As Boolean
 
 
 
@@ -28,13 +29,21 @@ Private Sub Worksheet_Change(ByVal target As Range)
 
     
     If Not dumping Then
+    
+        If target.Columns.Count > 1 Then
+            MsgBox ("you can only change one column at a time - your change will be undone")
+            dumping = True
+            Application.Undo
+            dumping = False
+            Exit Sub
+        End If
 
         If Not Intersect(target, Range("E6:E17")) Is Nothing Then Call Me.mvp_adj
         If Not Intersect(target, Range("F6:F17")) Is Nothing Then Call Me.mvp_set
         If Not Intersect(target, Range("K6:K17")) Is Nothing Then Call Me.mvp_adj
         If Not Intersect(target, Range("L6:L17")) Is Nothing Then Call Me.mvp_set
-        'If Not Intersect(Target, Range("Q6:Q17")) Is Nothing Then Call Me.ms_adj
-        'If Not Intersect(Target, Range("R6:R17")) Is Nothing Then Call Me.ms_set
+        If Not Intersect(target, Range("Q6:Q17")) Is Nothing Then Call Me.ms_adj
+        If Not Intersect(target, Range("R6:R17")) Is Nothing Then Call Me.ms_set
             
     End If
     
@@ -89,15 +98,102 @@ Sub ms_set()
 
     Dim i As Integer
     Call Me.get_sheet
+    Dim vp As String
+    vp = Sheets("month").Range("R2")
 
     For i = 1 To 12
-        units(i, 4) = units(i, 5) - (units(i, 2) + units(i, 3))
-        price(i, 4) = price(i, 5) - (price(i, 2) + price(i, 3))
-        sales(i, 5) = units(i, 5) * price(i, 5)
-        sales(i, 4) = sales(i, 5) - (sales(i, 2) + sales(i, 3))
+        If Round(sales(i, 5) - (sales(i, 2) + sales(i, 3)), 6) <> Round(sales(i, 4), 6) Then
+            sales(i, 4) = sales(i, 5) - (sales(i, 2) + sales(i, 3))
+            Select Case vp
+                Case "volume"
+                    If co_num(price(i, 5), 0) = 0 Then
+                        MsgBox ("price cannot be -0- and also have sales - your change will be undone")
+                        dumping = True
+                        Application.Undo
+                        dumping = False
+                        Exit Sub
+                    End If
+                    'reset price to original - delete these lines if a cascading effect is desired
+                    'price(i, 4) = 0
+                    'price(i, 5) = price(i, 2) + price(i, 3)
+                    'calc volume change on original price
+                    units(i, 5) = sales(i, 5) / price(i, 5)
+                    units(i, 4) = units(i, 5) - (units(i, 2) + units(i, 3))
+                Case "price"
+                    If co_num(units(i, 5), 0) = 0 Then
+                        MsgBox ("volume cannot be -0- and also have sales - your change will be undone")
+                        dumping = True
+                        Application.Undo
+                        dumping = False
+                        Exit Sub
+                    End If
+                    price(i, 5) = sales(i, 5) / units(i, 5)
+                    price(i, 4) = price(i, 5) - (price(i, 2) + price(i, 3))
+                Case Else
+                    MsgBox ("error forcing sales with no offset specified - your change will be undone")
+                    dumping = True
+                    Application.Undo
+                    dumping = False
+                    Exit Sub
+            End Select
+        End If
+        Call Me.build_json(i)
     Next i
     
-    set_sheet
+    Me.crunch_array
+    Me.set_sheet
+    
+        
+End Sub
+
+Sub ms_adj()
+
+    Dim i As Integer
+    Call Me.get_sheet
+    Dim vp As String
+    vp = Sheets("month").Range("R2")
+
+    For i = 1 To 12
+        If Round(sales(i, 5), 6) <> Round(sales(i, 2) + sales(i, 3) + sales(i, 4), 6) Then
+            sales(i, 5) = sales(i, 4) + sales(i, 2) + sales(i, 3)
+            Select Case vp
+                Case "volume"
+                    If co_num(price(i, 5), 0) = 0 Then
+                        MsgBox ("price cannot be -0- and also have sales - your change will be undone")
+                        dumping = True
+                        Application.Undo
+                        dumping = False
+                        Exit Sub
+                    End If
+                    'reset price to original
+                    'price(i, 4) = 0
+                    'price(i, 5) = price(i, 2) + price(i, 3)
+                    'calc volume change on original price
+                    units(i, 5) = sales(i, 5) / price(i, 5)
+                    units(i, 4) = units(i, 5) - (units(i, 2) + units(i, 3))
+                Case "price"
+                    If co_num(units(i, 5), 0) = 0 Then
+                        MsgBox ("volume cannot be -0- and also have sales - your change will be undone")
+                        dumping = True
+                        Application.Undo
+                        dumping = False
+                        Exit Sub
+                    End If
+                    price(i, 5) = sales(i, 5) / units(i, 5)
+                    price(i, 4) = price(i, 5) - (price(i, 2) + price(i, 3))
+                Case Else
+                    MsgBox ("error forcing sales with no offset specified - your change will be undone")
+                    dumping = True
+                    Application.Undo
+                    dumping = False
+                    Exit Sub
+            End Select
+        End If
+        Call Me.build_json(i)
+    Next i
+    
+    Me.crunch_array
+    Me.set_sheet
     
         
 End Sub
@@ -274,7 +370,7 @@ Sub build_json(ByVal pos As Integer)
 
     'if something is changing
     If Round(units(pos, 4), 2) <> 0 Or Round(price(pos, 4), 8) <> 0 Or Round(sales(pos, 4), 8) <> 0 Then
-        Set adjust(pos) = basejson
+        Set adjust(pos) = JsonConverter.ParseJson(JsonConverter.ConvertToJson(basejson))
         'if there is no existing volume on the target month but units are being added
         If units(pos, 2) + units(pos, 3) = 0 And units(pos, 4) <> 0 Then
             'add month
@@ -326,7 +422,11 @@ Sub crunch_array()
     'base
     tprice(1, 2) = tsales(1, 2) / tunits(1, 2)
     'forecast
-    tprice(1, 5) = tsales(1, 5) / tunits(1, 5)
+    If tunits(1, 5) <> 0 Then
+        tprice(1, 5) = tsales(1, 5) / tunits(1, 5)
+    Else
+        tprice(1, 5) = 0
+    End If
     'adjust
     tprice(1, 3) = (tsales(1, 2) + tsales(1, 3)) / (tunits(1, 2) + tunits(1, 3)) - tprice(1, 2)
     'current adjust
@@ -334,3 +434,15 @@ Sub crunch_array()
     
 
 End Sub
+
+Sub cancel()
+
+    Sheets("Orders").Select
+
+End Sub
+
+Sub reset()
+
+    Call Me.load_sheet
+    
+End Sub