diff --git a/unserialize_field/ir_model_fields.py b/unserialize_field/ir_model_fields.py
index 4c478546d..10986035f 100644
--- a/unserialize_field/ir_model_fields.py
+++ b/unserialize_field/ir_model_fields.py
@@ -33,6 +33,7 @@ class ir_model_fields(Model):
         for this in self.browse(cr, uid, ids, context=context):
             pool_obj = self.pool.get(this.model_id.model)
             self.create_database_column(cr, uid, pool_obj, this.name)
+            this.write({'state': 'manual'})
             while True:
                 ids = pool_obj.search(
                         cr, uid, 
diff --git a/unserialize_field/ir_model_fields.xml b/unserialize_field/ir_model_fields.xml
index 7be28d00c..17f6701bb 100644
--- a/unserialize_field/ir_model_fields.xml
+++ b/unserialize_field/ir_model_fields.xml
@@ -10,7 +10,7 @@
                     <field name="serialization_field_id" position="after">
                         <button type="object" name="action_unserialize_field"
                             string="Unserialize field" colspan="4"
-                            attrs="{'invisible': [('serialization_field_id','=',False)]}"
+                            attrs="{'invisible': ['|', ('serialization_field_id','=',False), ('state', '!=', 'manual')]}"
                             />
                     </field>
                 </data>