diff --git a/operation.py b/operation.py
index e0a5618..f5f1473 100644
--- a/operation.py
+++ b/operation.py
@@ -557,6 +557,11 @@ class PurchaseLine(metaclass=PoolMeta):
             origins += ['purchase.request']
         except KeyError:
             pass
+        try:
+            Pool().get('sale.sale')
+            origins += ['sale.sale']
+        except KeyError:
+            pass
         return origins
 
     @classmethod
@@ -589,9 +594,14 @@ class CreatePurchase(metaclass=PoolMeta):
 
     @classmethod
     def compute_purchase_line(cls, key, requests, purchase):
+        Line = Pool().get('purchase.line')
 
         line = super().compute_purchase_line(key, requests, purchase)
-        if requests:
-            request = requests[0]
-            line.origin = request.origin
+
+        origins = [k[0] for k in Line.get_origin()]
+
+        for origin in [request.origin for request in requests if request.origin]:
+            if origin.__name__ in origins:
+                line.origin = origin
+                break
         return line
diff --git a/tryton.cfg b/tryton.cfg
index b8b4600..2d0d721 100644
--- a/tryton.cfg
+++ b/tryton.cfg
@@ -3,6 +3,7 @@ version=6.9.0
 depends:
     production_route
 extras_depend:
+    sale
     stock_supply_production
     purchase_request
 xml: