diff --git a/src/main/java/edu/harvard/mcz/imagecapture/entity/SpecimenPartAttribute.java b/src/main/java/edu/harvard/mcz/imagecapture/entity/SpecimenPartAttribute.java
index 1592801..3870d19 100644
--- a/src/main/java/edu/harvard/mcz/imagecapture/entity/SpecimenPartAttribute.java
+++ b/src/main/java/edu/harvard/mcz/imagecapture/entity/SpecimenPartAttribute.java
@@ -177,7 +177,7 @@ public void setAttributeDate(Date prepTypeAttributeDate) {
   @Override
   public Object clone() {
     SpecimenPartAttribute newAttr = new SpecimenPartAttribute(
-        (SpecimenPart)specimenPartId.clone(), attributeType, attributeValue,
+        null, attributeType, attributeValue,
         attributeUnits, attributeRemark, attributeDeterminer,
         (Date)attributeDate.clone());
     return newAttr;