diff --git a/issue12678.diff b/issue12678.diff
index e07d375..dffa76c 100644
--- a/issue12678.diff
+++ b/issue12678.diff
@@ -35,7 +35,7 @@ index d0b426bc4e..e874e24c4c 100644
 +    @classmethod
 +    def delete(cls, lines):
 +        for line in lines:
-+            if line.statement_state != {'cancelled', 'draft'}:
++            if line.statement_state not in {'cancelled', 'draft'}:
 +                raise AccessError(
 +                    gettext(
 +                        'account_statement.'
@@ -54,7 +54,7 @@ index d0b426bc4e..e874e24c4c 100644
 +    @classmethod
 +    def delete(cls, origins):
 +        for origin in origins:
-+            if origin.statement_state != {'cancelled', 'draft'}:
++            if origin.statement_state not in {'cancelled', 'draft'}:
 +                raise AccessError(
 +                    gettext(
 +                        'account_statement.'