How to generate illegal AHB transactions using eVC

Hi, 

I am trying to generate some illegal AHB transactions to test how the DUT behaves.

For example, I generated a WORD transaction, then changed the 4-byte aligned address to one that did not align.

I have turned off the checkers in both the master agent and the slave agent by keeping has_check == FALSE;

However, when running the simulation, I still got a constraint contradiction saying that,

   *** Error: Contradiction at time 90000, when generating burst (of type vr_ahb_master_driven_burst)

The test was terminated right after this, so  it failed to do the job.

Any ideas how to do this?

Thanks in advance.