diff --git a/addons/purchase/report/purchase_report.py b/addons/purchase/report/purchase_report.py
index ff69fee0e7f..08904bb3f85 100644
--- a/addons/purchase/report/purchase_report.py
+++ b/addons/purchase/report/purchase_report.py
@@ -92,7 +92,10 @@ class PurchaseReport(models.Model):
                     sum(l.product_qty / line_uom.factor * product_uom.factor) as qty_ordered,
                     sum(l.qty_received / line_uom.factor * product_uom.factor) as qty_received,
                     sum(l.qty_invoiced / line_uom.factor * product_uom.factor) as qty_billed,
-                    sum(l.product_qty / line_uom.factor * product_uom.factor) - sum(l.qty_received / line_uom.factor * product_uom.factor) as qty_to_be_billed
+                    case when t.purchase_method = 'purchase' 
+                         then sum(l.product_qty / line_uom.factor * product_uom.factor) - sum(l.qty_invoiced / line_uom.factor * product_uom.factor)
+                         else sum(l.qty_received / line_uom.factor * product_uom.factor) - sum(l.qty_invoiced / line_uom.factor * product_uom.factor)
+                    end as qty_to_be_billed
         """ % self.env['res.currency']._select_companies_rates()
         return select_str
 
@@ -135,6 +138,7 @@ class PurchaseReport(models.Model):
                 line_uom.uom_type,
                 line_uom.category_id,
                 t.uom_id,
+                t.purchase_method,
                 line_uom.id,
                 product_uom.factor,
                 partner.country_id,