Feat: Se añande atributo delete_lines

__init__.py

@@ -2,12 +2,13 @@
 # this repository contains the full copyright notices and license terms.
 
 from trytond.pool import Pool
-
+from . import sale
 __all__ = ['register']
 
 
 def register():
     Pool.register(
+        sale.Sale,
         module='sale_line_delete_log', type_='model')
     Pool.register(
         module='sale_line_delete_log', type_='wizard')