diff --git a/src/Informedica.GenOrder.Lib/DrugOrder.fs b/src/Informedica.GenOrder.Lib/DrugOrder.fs
index 17f9b33..8f2845a 100644
--- a/src/Informedica.GenOrder.Lib/DrugOrder.fs
+++ b/src/Informedica.GenOrder.Lib/DrugOrder.fs
@@ -166,7 +166,6 @@ module DrugOrder =
         // create the units
         let cu = "x[Count]"
         let ml = "ml[Volume]"
-        let dr = "dr[Volume]"
 
         let ou = d.Unit |> unitGroup
         let au =
diff --git a/src/Informedica.GenOrder.Lib/OrderVariable.fs b/src/Informedica.GenOrder.Lib/OrderVariable.fs
index d18f116..b65374e 100644
--- a/src/Informedica.GenOrder.Lib/OrderVariable.fs
+++ b/src/Informedica.GenOrder.Lib/OrderVariable.fs
@@ -313,7 +313,6 @@ module OrderVariable =
     let setUnit (ovar: OrderVariable) =
         [
             ovar.Constraints.Min |> Option.map (Minimum.toValueUnit >> ValueUnit.getUnit)
-            ovar.Constraints.Incr |> Option.map (Increment.toValueUnit >> ValueUnit.getUnit)
             ovar.Constraints.Max |> Option.map (Maximum.toValueUnit >> ValueUnit.getUnit)
             ovar.Constraints.Values |> Option.map (ValueSet.toValueUnit >> ValueUnit.getUnit)
         ]
@@ -347,6 +346,7 @@ module OrderVariable =
             member val Name = "" with get, set
             member val Constraints = Variable.Dto.dto () with get, set
             member val Variable = Variable.Dto.dto () with get, set
+            member val Unit = "" with get, set
 
 
         /// Create a new `Dto` for an OrderVariable
@@ -380,6 +380,7 @@ module OrderVariable =
 
                 let min  = dto.Constraints.MinOpt  |> Option.bind (ValueUnit.Dto.fromDto >> (Option.map (Minimum.create  dto.Constraints.MinIncl)))
                 let max  = dto.Constraints.MaxOpt  |> Option.bind (ValueUnit.Dto.fromDto >> (Option.map (Maximum.create  dto.Constraints.MaxIncl)))
+
                 Constraints.create min incr max vs
 
             let n = dto.Name |> Name.fromString
diff --git a/src/Informedica.GenOrder.Lib/Types.fs b/src/Informedica.GenOrder.Lib/Types.fs
index ad868e9..6d26e36 100644
--- a/src/Informedica.GenOrder.Lib/Types.fs
+++ b/src/Informedica.GenOrder.Lib/Types.fs
@@ -21,9 +21,11 @@ module Types =
         /// </summary>
         type OrderVariable =
             {
+                /// The Constraints to apply to the Variable
                 Constraints : Constraints
                 /// Stores the values/range
                 Variable:  Variable
+
             }
         and Constraints =
             {