diff --git a/openbis/sourceTest/java/ch/systemsx/cisd/openbis/generic/server/business/bo/PropertyValidatorTest.java b/openbis/sourceTest/java/ch/systemsx/cisd/openbis/generic/server/business/bo/PropertyValidatorTest.java
index 71b56cecb41eb0d51ce3b3a1c10702664c55748a..6a6f563d20b8b54c8a4aa10189edf11b1e55cf84 100644
--- a/openbis/sourceTest/java/ch/systemsx/cisd/openbis/generic/server/business/bo/PropertyValidatorTest.java
+++ b/openbis/sourceTest/java/ch/systemsx/cisd/openbis/generic/server/business/bo/PropertyValidatorTest.java
@@ -299,8 +299,11 @@ public final class PropertyValidatorTest extends AbstractBOTest
             fail(String.format("'%s' expected.", UserFailureException.class.getSimpleName()));
         } catch (final UserFailureException ex)
         {
-            assertEquals("Material specification '" + value
-                    + "' has improper format. Expected '<CODE> (<TYPE>)'.", ex.getMessage());
+            assertEquals(
+                    "Material specification '"
+                            + value
+                            + "' has improper format. Expected format is '<CODE> (<TYPE>)'. Type has to be specified because any type of material can be assigned.",
+                    ex.getMessage());
         }
     }