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Hi all, There is one register model such as this: class R_r extends uvm_reg; uvm_reg_field vaule; ... endclass : R_r class A_R_file extends uvm_reg_file; R_r R; ... endclass : A_R_file class R_model extends uvm_reg_block; A_R_file R_f; ... endclass : R_model class my_r_seq extends uvm_reg_sequence; R_model regmodel; ... write_reg(regmodel.R_f.R, status, wdata); peek_reg (regmodel.R_f.R, status, rdata); ... endclass : my_r_seq R_r is write-only, when reading R_r via backdoor as above, VCS reports such an error. UVM_ERROR /EDA_Too