diff --git a/Modules.Jobs/EDMI/ZUGFeRD/ImportZUGFeRDFiles.vb b/Modules.Jobs/EDMI/ZUGFeRD/ImportZUGFeRDFiles.vb
index d4e91d3d..fdf6e348 100644
--- a/Modules.Jobs/EDMI/ZUGFeRD/ImportZUGFeRDFiles.vb
+++ b/Modules.Jobs/EDMI/ZUGFeRD/ImportZUGFeRDFiles.vb
@@ -197,7 +197,10 @@ Public Class ImportZUGFeRDFiles
 
                         Try
                             For Each oFile In oFileGroupFiles
-                                Dim oDocument As CrossIndustryDocumentType
+                                ' 09.12.2021: oDocument is now an Object, because have different classes corresponding to the 
+                                ' different versions of ZUGFeRD and the type is unknown at compile-time.
+                                Dim oDocument As Object
+
                                 ' Start a global group counter for each file
                                 Dim oGlobalGroupCounter = 0
                                 ' Clear missing properties for the new file