diff --git a/python/obitools3/commands/import.pyx b/python/obitools3/commands/import.pyx
index 1d064d9..b5a7de0 100644
--- a/python/obitools3/commands/import.pyx
+++ b/python/obitools3/commands/import.pyx
@@ -192,7 +192,7 @@ def run(config):
                     qual_col[i] = seq['quality']
             
             for tag in seq['tags'] :
-    
+                            
                 value = seq['tags'][tag]
                 
                 if tag not in dcols :
@@ -234,7 +234,7 @@ def run(config):
                         dcols[tag][0][i] = value
                     
                     except IndexError :
-                        
+                                                
                         value_type = type(value)
                         old_column = dcols[tag][0]
                         old_nb_elements_per_line = old_column.nb_elements_per_line
@@ -248,7 +248,7 @@ def run(config):
                         if value_type == dict :    # Check dictionary keys
                             for k in value :
                                 if k not in old_elements_names :
-                                    new_elements_names = list(value)
+                                    new_elements_names = list(set(old_elements_names+[tobytes(k) for k in value]))
                                     rewrite = True
                                     break
                         
@@ -263,18 +263,22 @@ def run(config):
                             if new_nb_elements_per_line == 0 and new_elements_names is not None :
                                 new_nb_elements_per_line = len(new_elements_names)
                             
+                            # Reset obierrno 
+                            obi_errno = 0
+
                             dcols[tag] = (view.rewrite_column_with_diff_attributes(old_column.name, 
                                                                                    new_data_type=new_type, 
                                                                                    new_nb_elements_per_line=new_nb_elements_per_line,
                                                                                    new_elements_names=new_elements_names), 
                                           value_obitype)
                             
-                            # Reset obierrno
-                            obi_errno = 0
+                            # Update the dictionary:
+                            for t in dcols :
+                                dcols[t] = (view[t], dcols[t][1])
                             
                             # Fill value
                             dcols[tag][0][i] = value
-        
+                                    
             i+=1
 
     print("\n")