check for AbstractXMLDeclarationCompleteBusDataProvider instead of...

check for AbstractXMLDeclarationCompleteBusDataProvider instead of ConventionalCompletedBusDataProvider when loading a step input

VECTO3GUI2020/ViewModel/MultiStage/Implementation/CreateVifViewModel.cs

@@ -349,7 +349,7 @@ namespace VECTO3GUI2020.ViewModel.MultiStage.Implementation
 			{
 				var inputData = _inputDataReader.Create(fileName) as IDeclarationInputDataProvider;
 				vehicleInputData = inputData.JobInputData.Vehicle;
-				valid = (inputData != null) && (vehicleInputData is XMLDeclarationConventionalCompletedBusDataProviderV24) || (vehicleInputData is XMLDeclarationExemptedCompletedBusDataProviderV24);
+				valid = (inputData != null) && (vehicleInputData is AbstractXMLDeclarationCompletedBusDataProviderV24) || (vehicleInputData is XMLDeclarationExemptedCompletedBusDataProviderV24);
 			}
 			catch (Exception e)
 			{