You can only execute that operation once.
Not strictly true. You can execute the smt_create
operation more than once for a given NAI if you want to perform the "reset case." See:
https://developers.steem.io/apidefinitions/#broadcast_ops_smt_create
I ment that more in the usual workflow. didn't want to delve too much into the specific cases. But true.
Yeah, hopefully that'll be a rare situation.