diff --git a/modules/purchase/purchase.py b/modules/purchase/purchase.py
index ca5acbb..ec2fadb 100755
--- a/modules/purchase/purchase.py
+++ b/modules/purchase/purchase.py
@@ -1873,6 +1873,7 @@ class Line(sequence_ordered(), ModelSQL, ModelView):
                 invoice_line.unit_price = l.get_lot_price()
                 invoice_line.product = l.lot_product
                 invoice_line.quantity = quantity
+                logger.info("GETINVOICELINE_QT:%s",quantity)
                 if not invoice_line.quantity:
                     return []
                 invoice_line.unit = self.unit