diff --git a/src/main/java/org/iata/cargo/model/Piece.java b/src/main/java/org/iata/cargo/model/Piece.java
index 658a09b..2307e6c 100644
--- a/src/main/java/org/iata/cargo/model/Piece.java
+++ b/src/main/java/org/iata/cargo/model/Piece.java
@@ -219,7 +219,6 @@ public class Piece
      */
     @OWLObjectProperty(iri = Vocabulary.s_p_volumetricWeight)
     @ParticipationConstraints({
-        @ParticipationConstraint(owlObjectIRI = Vocabulary.s_c_Thing, min = 1, max = -1),
         @ParticipationConstraint(owlObjectIRI = Vocabulary.s_c_Thing, max = 1)
     })
     @JsonProperty(Vocabulary.s_p_volumetricWeight)