usecases.md

@@ -15,4 +15,7 @@
 
 
 ## UC X: Import dataset file
-This use case is about importing the dataset files. In the view you can select a study or not and the file is loaded from the disk. Some statistics and errors are/should be shown. The information is stored in the temporary DDIFlatDB.
+This use case is about importing the dataset files. In the view you can select a study or not and the file is loaded from the disk. Some statistics and errors are/should be shown. The information is stored in the temporary DDIFlatDB. The import always overwrites the latest import of the same file.
+
+## UC X: Connect a dataset file with a study in DBK
+A dataset file can be imported either given an existing study or