tx_cmd_nvalues
int tx_cmd_nvalues(tx_commit_data_t *, size_t, uint32_t *);
if (tx_cmd_nvalues(tx_data, cmd_no, &nvalues) != REP_PROTOCOL_SUCCESS)
if (tx_cmd_nvalues(tx_data, cmd_no, &nvalues) != REP_PROTOCOL_SUCCESS)