diff --git a/modules/purchase_trade/stock.py b/modules/purchase_trade/stock.py
index 44d08b0..8e87369 100755
--- a/modules/purchase_trade/stock.py
+++ b/modules/purchase_trade/stock.py
@@ -721,7 +721,7 @@ class ShipmentIn(metaclass=PoolMeta):
                             {
                                 "filename": attachments[0].name,
                                 "content": content_b64,
-                                "content_type": attachments[0].mimetype or "application/pdf"
+                                "content_type": "application/pdf"
                             }
                         ]