diff --git a/purchase.py b/purchase.py
index 61dd9b083c..355df42e62 100644
--- a/purchase.py
+++ b/purchase.py
@@ -53,18 +53,16 @@ class Purchase:
         if invoice:
             lines_to_delete = [l for l in invoice.lines if l.type != 'line']
             lines = [l for l in invoice.lines if l.type == 'line']
-            invoice_line_ids = [l.id for l in lines]
-            with Transaction().set_user(0, set_context=True):
-                InvoiceLine.write(lines, {
-                    'invoice': None,
-                    'invoice_type': invoice.type,
-                    'party': invoice.party.id,
-                    'currency': invoice.currency.id,
-                    'company': invoice.company.id,
-                    })
-                InvoiceLine.delete(lines_to_delete)
-                Invoice.cancel([invoice])
-                Invoice.delete([invoice])
+            InvoiceLine.write(lines, {
+                'invoice': None,
+                'invoice_type': invoice.type,
+                'party': invoice.party.id,
+                'currency': invoice.currency.id,
+                'company': invoice.company.id,
+                })
+            InvoiceLine.delete(lines_to_delete)
+            Invoice.cancel([invoice])
+            Invoice.delete([invoice])
             return None
         return invoice