diff --git a/product/ERP5/tests/testPayroll.py b/product/ERP5/tests/testPayroll.py
index d9ca54a125609f0621d8f645e1c637c55fdbe60e..3ab812acb8c9cc04432e7c8b8991cf7a16df1e08 100644
--- a/product/ERP5/tests/testPayroll.py
+++ b/product/ERP5/tests/testPayroll.py
@@ -1703,6 +1703,7 @@ class TestPayrollMixin(ERP5ReportTestCase, TestTradeModelLineMixin):
     labour = sequence.get('labour_service_output')
     line = model.newContent(
           id='line',
+          reference='zero_price_line',
           portal_type='Pay Sheet Model Line',
           resource_value=labour,
           base_contribution_list=['base_amount/base_salary',