When writing to a field in a register in Config seq vs other sequnces

I write to the registers field(specman field) in the config seq and then the value is written to the register.
When I do the same in another sequence (MAIN), it only updates the specman fields without writing to the register in the dut.
I think that at the end of “do config_seq” the fields are written to the dut registers.
What should I do if I want to update only the specman fields without the writing to the dut registers.