From 0e2b70bbc456ab70e2b77dd531479ab3d30ce2fe Mon Sep 17 00:00:00 2001
From: Sergio Morillo <sergio.morillo@datalifeit.es>
Date: Tue, 14 Jan 2020 12:00:04 +0100
Subject: [PATCH] Allow to go back with applied costs.

This commit refs #11363
---
 sale_cost.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sale_cost.py b/sale_cost.py
index 2a3a21f..d391ec4 100644
--- a/sale_cost.py
+++ b/sale_cost.py
@@ -54,3 +54,7 @@ class SaleCost(ApplyMethodCostDocumentMixin, metaclass=PoolMeta):
             invisible_condition,
             Not(Bool(Eval('invoice_lines'))))
         cls._buttons['unapply']['depends'].append('invoice_lines')
+
+    @property
+    def non_explodable(self):
+        return super().non_explodable or bool(self.invoice_lines)