This will depend on how many ip address you are using in the dmz . If for eg, you have have both a private and public ip configured on a server in the dmz zone that requires access from both inside and outside. then you would have to configure nat for outside to inside and no nat from inside to dmz.
pls elaborate on your setup
if you just want a nat command then
static ( dmz, ouside) public ip dmz ip netmask 255.255.255.0