Transaction /DBM/C_ORD_NR does not exist

Hi DBM Expert,

We are in DBM 7.0 now and when i go to tcode /DBM/C_ORD_NR to maintain number range for order type.

The system come out say "Transaction /DBM/C_ORD_NR does not exist" Message no. S#343

Please advise is there any configure or activation need to be done?

Thanks

regards,

ng chong chuan