use default values for eco roll and engine stop/start in case of HEV and PEV...

use default values for eco roll and engine stop/start in case of HEV and PEV vehicles in the view model to avoid validation errors

VECTO3GUI2020/ViewModel/MultiStage/Implementation/InterimStageBusVehicleViewModel.cs

@@ -947,7 +947,7 @@ namespace VECTO3GUI2020.ViewModel.MultiStage.Implementation
 			}
 		}
 
-		public bool? EngineStopStartNullable
+		public virtual bool? EngineStopStartNullable
 		{
 			get => _engineStopStartNullable;
 			set
@@ -966,7 +966,7 @@ namespace VECTO3GUI2020.ViewModel.MultiStage.Implementation
 			}
 		}
 
-		public EcoRollType? EcoRollTypeNullable
+		public virtual EcoRollType? EcoRollTypeNullable
 		{
 			get => _ecoRollTypeNullable;
 			set
@@ -1336,6 +1336,11 @@ namespace VECTO3GUI2020.ViewModel.MultiStage.Implementation
 
 		public override bool EcoRollEnabled => false;
 
+		public override EcoRollType? EcoRollTypeNullable {
+			get { return EcoRollType.None; }
+			set { }
+		}
+
         public override bool ATEcoRollReleaseLockupClutchEnabled => false;
 
 
@@ -1363,8 +1368,20 @@ namespace VECTO3GUI2020.ViewModel.MultiStage.Implementation
 
 		public override bool EcoRollEnabled => false;
 
+		public override EcoRollType? EcoRollTypeNullable
+		{
+			get { return EcoRollType.None; }
+			set { }
+		}
+
 		public override bool EngineStopStartEnabled => false;
 
+		public override bool? EngineStopStartNullable
+		{
+			get { return false; }
+			set { }
+		}
+
 		public override bool ATEcoRollReleaseLockupClutchEnabled => false;
 
 
@@ -1391,8 +1408,18 @@ namespace VECTO3GUI2020.ViewModel.MultiStage.Implementation
 
 		public override bool EcoRollEnabled => false;
 
+		public override EcoRollType? EcoRollTypeNullable {
+			get { return EcoRollType.None; }
+			set { }
+		}
+
         public override bool EngineStopStartEnabled => false;
 
+		public override bool? EngineStopStartNullable {
+			get { return false; }
+			set { }
+		}
+		
 		public override bool ATEcoRollReleaseLockupClutchEnabled => false;