diff --git a/src/paveit/io/geosys.py b/src/paveit/io/geosys.py
index f980b40..397812c 100755
--- a/src/paveit/io/geosys.py
+++ b/src/paveit/io/geosys.py
@@ -64,26 +64,32 @@ def read_geosys(buffer: BytesIO,
         #Daten einlesen und umwandeln
         #---------------------------------------------------------------------
 
-        data = []
 
         #Einlesen
         buffer.seek(0)
 
-        lines_file = buffer.readlines()
-
-        for line in lines_file:
+        lines = buffer.readlines()
+        print(len(lines))
+        
+        data = []
+        
+        for line in lines:
             try:
                 line = line.decode(encoding)
                 line = line.split('\t')
 
-                if len(line) > 2:
-                    data.append(line)
-
+                if len(line) > 2:   
+                    v = line[0][0:3]
+                    if len(v) == 3:
+                        if (table == v) or (pkdata == v) or (v in metadata_ids):
+                            data.append(line)
             except:
+                raise
                 pass
-
+        
         if debug:
             print('Anz. Datensätze: ', str(len(data)), getsizeof(data))
+            
         #aufräumen
         ##Datenstruktur anlegen
 
@@ -107,10 +113,12 @@ def read_geosys(buffer: BytesIO,
 
         # replace object
         data = data_processed
+        
+        assert len(data['data']) != 0
 
         if debug:
             print('data_clean fin')
-
+            
         ## Header aufbereiten
 
         for idx, row in enumerate(data['head']):
@@ -133,6 +141,7 @@ def read_geosys(buffer: BytesIO,
 
                 if debug:
                     print(id_durchmesser, id_hoehe, id_name)
+            
             elif idx == 1:
                 unit_durch = None
                 unit_hoehe = None
@@ -164,15 +173,19 @@ def read_geosys(buffer: BytesIO,
         }
 
         meta = data['metadata']
-
+        
         for key in meta.keys():
             sel = meta[key]
 
             assert len(sel[0]) == len(sel[2])
-            header_append = {
-                sel[0][i]: sel[2][i].strip()
-                for i in range(len(sel[0]))
-            }
+            
+            if len(sel) <= 3:
+                d = { sel[0][i]: sel[2][i].strip() for i in range(len(sel[0])) }
+            # Fix: In Geosys gibt es den Parameter Oberspannung zweimal. Erster entfernen
+            else:    
+                d = { sel[0][i]: sel[3][i].strip() for i in range(len(sel[0])) }
+                
+            header_append = d
 
             header.update(header_append)
 
@@ -186,10 +199,12 @@ def read_geosys(buffer: BytesIO,
             print('daten umwandel')
 
         temp = []
+        
         for idx, row in enumerate(data['data']):
+            
             if idx == 0:
                 if debug:
-                    print('head')
+                    print('convert head')
                 data_head = []
                 for idx_name, name in enumerate(row):
                     if idx_name <= 1: continue