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When a driver returns a response to the sequence, it calls 'set_id_info()' to set the identifiers of the transactions returned. This way, the originating sequence can correlate the response and the originating transaction, by matching the 2 fields sequence_id and transaction_id. This has a couple of drawbacks : the sequence writer must set this field 'transaction_id' by hand the transanction_id may not be unique - a bug can be introduced (sequence/driver) and go unnnoticed when the wrong matching occurs - worst scenario is when a user simply forgets to set it, and the matching still occurs, but is wrong ! An improvement/fix to address these 2 issues would be to use field 'inst_id' (which is unique) instead of 'transaction_id' (user defined). It looks to me the original intention was to use this field rather than 'transaction_id'. The code change would be : function void set_id_info(uvm_sequence_item item); if (item == null) begin uvm_report_fatal(get_full_name(), "set_id_info called with null parameter", UVM_NONE); end /* this.set_transaction_id(item.get_transaction_id()); */ this.set_transaction_id(item.get_inst_id()); this.set_sequence_id(item.get_sequence_id()); endfunction