diff --git a/Jobs/ZUGFeRD/ImportZUGFeRDFiles.vb b/Jobs/ZUGFeRD/ImportZUGFeRDFiles.vb
index f8a0171b..88b98b26 100644
--- a/Jobs/ZUGFeRD/ImportZUGFeRDFiles.vb
+++ b/Jobs/ZUGFeRD/ImportZUGFeRDFiles.vb
@@ -285,7 +285,7 @@ Public Class ImportZUGFeRDFiles
                                 ' Check the document against the configured property map and return:
                                 ' - a List of valid properties 
                                 ' - a List of missing properties
-                                Dim oPropertyMap = GetPropertyMapFor(oArgs, oDocument)
+                                Dim oPropertyMap = GetPropertyMapFor(oArgs, oDocument.Specification)
                                 Dim oCheckResult = _zugferd.PropertyValues.CheckPropertyValues(oDocument.SchemaObject, oPropertyMap, oMessageId)
 
                                 _logger.Info("Properties checked: [{0}] missing properties / [{1}] valid properties found.", oCheckResult.MissingProperties.Count, oCheckResult.ValidProperties.Count)