AttestationCase - Get UID_Person

Hi there!

I have a problem i want to create a list of AttestationCases which belongs to a specify Identity, the Response Object from the Service gives an object back but there is no Identitifier for the Person.
In ObjectKeyBase is the XObjectKEy but if the identity is in a group than is the current ObjectKKeyBase not the same which i can filter with it ore something.