changes in get_invoice_line

purchase.py

@@ -85,6 +85,14 @@ class PurchaseLine(metaclass=PoolMeta):
             table_h.column_rename('discount', 'discount_old')
         super(PurchaseLine, cls).__register__(module_name)
 
+    def get_invoice_line(self):
+        'Return a list of invoice lines for sale line'
+        line = super(PurchaseLine, self).get_invoice_line()
+        if line and isinstance(line, list):
+            for l in line:
+                l.base_price = self.base_price
+        return line
+
     @fields.depends(
         methods=[
             'compute_base_price', 'on_change_with_discount_rate',