Change DocumentType to nullable XMLDocumentType

VECTO3GUI2020/ViewModel/Implementation/Document/DeclarationJobViewModel.cs

@@ -14,7 +14,7 @@ namespace VECTO3GUI2020.ViewModel.Implementation.Document
         #region Implementation of IDocumentViewModel
         public string DocumentName { get; }
 
-        public XmlDocumentType DocumentType { get; }
+        public XmlDocumentType? DocumentType { get; }
 
         public DataSource DataSource => _jobEditViewModel.DataSource;
 

VECTO3GUI2020/ViewModel/Implementation/Document/DeclarationTrailerJobDocumentViewModel.cs

@@ -13,7 +13,7 @@ namespace VECTO3GUI2020.ViewModel.Implementation.Document
         private string _name = "";
         public string DocumentName { get => _name; }
 
-        public XmlDocumentType DocumentType { get; }
+        public XmlDocumentType? DocumentType { get; }
 
 		public DataSource DataSource => throw new System.NotImplementedException();
 

VECTO3GUI2020/ViewModel/Implementation/Document/SimulationOnlyDeclarationJob.cs

@@ -18,10 +18,9 @@ namespace VECTO3GUI2020.ViewModel.Implementation.Document
 			set => _documentName = value;
 		}
 
-		public XmlDocumentType DocumentType
+		public XmlDocumentType? DocumentType
 		{
 			get => _documentType;
-			set => _documentType = value;
 		}
 
 		public DataSource DataSource
@@ -33,7 +32,7 @@ namespace VECTO3GUI2020.ViewModel.Implementation.Document
 		public IEditViewModel EditViewModel { get; set; }
 
 		private bool _selected;
-		private XmlDocumentType _documentType;
+		private XmlDocumentType? _documentType;
 		private string _documentName;
 		private DataSource _dataSource;
 

VECTO3GUI2020/ViewModel/Interfaces/Document/IDocumentViewModel.cs

@@ -8,7 +8,7 @@ namespace VECTO3GUI2020.ViewModel.Interfaces.Document
     public interface IDocumentViewModel
     {
         string DocumentName { get; }
-        XmlDocumentType DocumentType { get; }
+        XmlDocumentType? DocumentType { get; }
 		DataSource DataSource { get; }
 		IEditViewModel EditViewModel { get; }
 		bool Selected { get; set; }

VECTO3GUI2020/ViewModel/MultiStage/Implementation/CreateVifViewModel.cs

@@ -283,7 +283,8 @@ namespace VECTO3GUI2020.ViewModel.MultiStage.Implementation
 			if (path == null) {
 				return null;
 			}
-
+			
+			
 			var jsonJob = new JSONJob() {
 				Header = new JSONJobHeader() {
 					AppVersion = "Vecto3GUI2020",
@@ -453,8 +454,8 @@ namespace VECTO3GUI2020.ViewModel.MultiStage.Implementation
 			set => SetProperty(ref _documentName, value);
 		}
 
-
-		public XmlDocumentType DocumentType => throw new NotImplementedException();
+		//Remove this from
+		public XmlDocumentType? DocumentType => null;
 
 		public DataSource DataSource
 		{

VECTO3GUI2020/ViewModel/MultiStage/Implementation/MultistageJobViewModel_v0_1.cs

@@ -291,7 +291,7 @@ namespace VECTO3GUI2020.ViewModel.MultiStage.Implementation
 
 		public string DocumentName => Path.GetFileNameWithoutExtension(_inputData.DataSource.SourceFile);
 
-		public XmlDocumentType DocumentType => XmlDocumentType.MultistageOutputData;
+		public XmlDocumentType? DocumentType => XmlDocumentType.MultistageOutputData;
 
 		public DataSource DataSource => _dataSource;
 

VECTO3GUI2020/ViewModel/MultiStage/Implementation/StageInputViewModel.cs

@@ -103,7 +103,7 @@ namespace VECTO3GUI2020.ViewModel.MultiStage.Implementation
 			set => SetProperty(ref _documentName, value);
 		}
 
-		public XmlDocumentType DocumentType => _documentType;
+		public XmlDocumentType? DocumentType => _documentType;
 
 		public DataSource DataSource
 		{