diff --git a/addons/purchase/stock.py b/addons/purchase/stock.py
index 950f5b591c0..2db1be29bdc 100644
--- a/addons/purchase/stock.py
+++ b/addons/purchase/stock.py
@@ -76,7 +76,7 @@ class stock_move(osv.osv):
             invoice_line_vals['purchase_line_id'] = move.purchase_line_id.id
             invoice_line_vals['account_analytic_id'] = move.purchase_line_id.account_analytic_id.id or False
         invoice_line_id = super(stock_move, self)._create_invoice_line_from_vals(cr, uid, move, invoice_line_vals, context=context)
-        if move.purchase_line_id:
+        if context.get('inv_type') in ('in_invoice', 'in_refund') and move.purchase_line_id:
             purchase_line = move.purchase_line_id
             self.pool.get('purchase.order.line').write(cr, uid, [purchase_line.id], {
                 'invoice_lines': [(4, invoice_line_id)]