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')

sale.py

@@ -0,0 +1,16 @@
+from trytond.pool import PoolMeta
+from trytond.model import fields
+from trytond.pyson import Eval
+
+
+class Sale(metaclass=PoolMeta):
+    __name__ = 'sale.sale'
+
+    delete_lines = fields.One2Many(
+        'sale.line',
+        'sale',
+        "Delete lines",
+        states={
+            'readonly': Eval('state') != 'draft'
+        }
+    )

sale_line_delete_log.py

@@ -1 +0,0 @@
-#

tests/scenario_sale_line_delete_log.rst

@@ -174,6 +174,7 @@ Delete a sale line::
   >>> sale.save()
   >>> len(sale.lines)
   2
+  >>> sale.delete_lines