diff --git a/tutorials/incompressible/pisoFoam/RAS/cavity/system/FOreference b/tutorials/incompressible/pisoFoam/RAS/cavity/system/FOreference
index f3e8484a76..cbd2b01b4d 100644
--- a/tutorials/incompressible/pisoFoam/RAS/cavity/system/FOreference
+++ b/tutorials/incompressible/pisoFoam/RAS/cavity/system/FOreference
@@ -13,10 +13,12 @@ reference1
     libs            (fieldFunctionObjects);
     field           U;
 
+    refValue        sample;  // Function1 type
+    position        (0 0 0); // Needed by sample Function1
+
     // Optional entries
     scale           1.0;
     offset          (0.0 0.0 0.0);
-    position        (0 0 0);
     interpolationScheme    cell;
 
     // Optional (inherited) entries
@@ -40,10 +42,12 @@ reference2
     libs            (fieldFunctionObjects);
     field           p;
 
+    refValue        sample;  // Function1 type
+    position        (0 0 0); // Needed by sample Function1
+
     // Optional entries
     scale           -2.0;
     offset          1.5;
-    position        (0 0 0);
     interpolationScheme    cellPoint;
 
     // Optional (inherited) entries