diff --git a/pdf_oralia/pages/charge.py b/pdf_oralia/pages/charge.py
index a6b6abf..d10c4b6 100644
--- a/pdf_oralia/pages/charge.py
+++ b/pdf_oralia/pages/charge.py
@@ -1,3 +1,5 @@
+import re
+
 import numpy as np
 import pandas as pd
 
@@ -13,15 +15,13 @@ def is_it(page_text):
     return False
 
 
-def get_lot(x):
+def get_lot(txt):
     """Return lot number from "RECAPITULATIF DES OPERATIONS" """
-    if x[:2].isdigit():
-        return x[:2]
-    if x[:1].isdigit():
-        return "0" + x[:1]
-    if x[:2] == "PC":
-        return "PC"
-    return ""
+    regex = r"[BSM](\d+)\s-"
+    result = re.findall(regex, txt)
+    if result:
+        return "{:02d}".format(int(result[0]))
+    return "*"
 
 
 def keep_row(row):