diff --git a/trytond/trytond/modules/project_invoice/work.py b/trytond/trytond/modules/project_invoice/work.py
index fcc41a2..3577e1f 100644
--- a/trytond/trytond/modules/project_invoice/work.py
+++ b/trytond/trytond/modules/project_invoice/work.py
@@ -515,9 +515,6 @@ class Work(metaclass=PoolMeta):

         invoiced_progress = sum(x.effort_hours for x in self.invoiced_progress)
         quantity = self.effort_hours * self.progress - invoiced_progress
-        if self.product:
-            quantity = Uom.compute_qty(
-                hour, quantity, self.product.default_uom)
         if quantity > 0:
             if not self.product:
                 raise InvoicingError(