The software uses a storable data element that does not have all of the associated control elements that are necessary to support comparison.
This pattern identifies situations where the persistent storable element has no dedicated control element aiming at handling comparison action elements from the list. In case of technologies with class elements, this means situations where the persistent storable element is a class that is made persistent while it does not implement method elements from the required comparison control element list is now composed of method elements. As an example, with Java, a required comparison control element list is {'hashCode()','equals()'} method elements.
