diff --git a/purchase.py b/purchase.py
index 40e142b..a9a33eb 100644
--- a/purchase.py
+++ b/purchase.py
@@ -58,7 +58,7 @@ class Purchase(metaclass=PoolMeta):
                             use=line.product.use,
                             biomedical_class=line.product.biomedical_class,
                             refurbish=line.refurbish,
-                            serial=config.serial_draft_sequence.get() if line.quantity > 1 else line.serial_equipment,
+                            serial=None if line.quantity > 1 else line.serial_equipment,
                             health_register=line.health_register,
                             software_version=line.software_version)
                         equipment.save()