diff --git a/sf_tool_management/wizard/wizard.py b/sf_tool_management/wizard/wizard.py
index 4edd3617..ea82d5dc 100644
--- a/sf_tool_management/wizard/wizard.py
+++ b/sf_tool_management/wizard/wizard.py
@@ -876,7 +876,7 @@ class StockPicking(models.Model):
         if not stock_id:
             num = "%05d" % 1
         else:
-            m = int(stock_id.name[-3:]) + 1
+            m = int(stock_id.name[-5:]) + 1
             num = "%05d" % m
         return name + str(num)