In reply to jerin:
Assertions are always signal- related. Defining a property/assertion allows you to switch-off thhe evaluation for certain periods using a corresponding signal.
The construct is
disable iff(your_signal).
As far as the value of your signal is high the evalution of your property is suppressed.
A reasobale solution would be to generate ‘your_signal’ in your driver, depending on a special indication in your seq_item.