Update app.py

app.py

@@ -34,7 +34,7 @@ def process_csv(input_file):
 
     # Convert the '請求日' column from YYYYMMDD to YYYY/MM/DD format
     df['請求日'] = df['請求日'].astype(str).apply(lambda x: x[:4] + '/' + x[4:6] + '/' + x[6:8])
-    df['ユーザ定義項目1'] = df['請求日']
+    df['明細ユーザ定義項目1'] = df['請求日']
 
 
     # Group by '請求番号' and modify rows