Is it necessary for sequencer and driver to be parametrized with same class

Hello,

I am trying to extend an existing class. The class has field which i want to subdivide into various sub fields and constrain my data as per sub fields. So, is it possible that i have sequencer parameterized with extended class as i am using a vip and dont want to do any changes to driver class.

The sequencer and driver must be parameterized with the same base class. But of course, your sequences can create extensions of that base class, and the driver may retrieve extensions as well. However, the driver will not be aware of any additional fields you have added except through virtual methods provided by the sequence item.