Data Utility on attribute at Structure Uses tab

Hello Friends,

I need to validate MPMOperation attribute at Uses tab (Process Plan Browser Structure tab).

As I know, Data Utility can be used in case of normal Create/Edit Page of an object, where as same data utility can not be called from Uses tab of Process Plan Structure page. I thing it works based on GWT components.

Do you have an any other idea?

Snapshot is attached where am updating the an attribute.