diff --git a/lib/caditem.py b/lib/caditem.py
index a8ed8b9..f2c858f 100644
--- a/lib/caditem.py
+++ b/lib/caditem.py
@@ -641,8 +641,6 @@ class CadItem(DataModel):
         self.check_key_both_columns("aenderungstext_sivas", "aenderungstext_neu", missing)
         # Freigabevermerk
         self.check_key_both_columns("freigabevermerk_sivas", "freigabevermerk_neu", missing)
-        # Automatische Zusatzinformationen
-        self.check_key_existence("zusatzinfos_auto_text", missing)
         if len(missing) > 0:
             return (False, missing)
         else:
@@ -870,7 +868,6 @@ class CadItem(DataModel):
 
             ret = False
             if re.findall(r'1 out of 1', content):
-                os.remove(path)
                 self.message_info('Preparation sucessful', 'preparation_sucessful', {'path':impf_pfad})
                 ret = True
             elif re.findall(r'Error', content):
@@ -1209,8 +1206,12 @@ class CadItem(DataModel):
 
         # Material
         material = self.get_content('material_sivas', 'material_neu')
+        
         if material:
-            data["WerkstoffNE"] = material
+            if not aus_halbzeug:
+                data["WerkstoffNE"] = material
+            else:
+                data["WerkstoffNE"] = ""
 
         # Oberfläche
         oberflaeche = self.get_gui_data('oberflaeche_neu')