Ila,
Do you mind if I ask you why you want to do change transport number range? I just spoke to one of my colleague, he said he hasn't done this before but It only makes sense if you have multiple projects going on in Dev system and you use project based transports. You will have to set the transport range..after discussing it with functional people and development team but he wouldn't recommend it because it is a big headache.
I am not sure if SE38 and running RSWBO301 is going to work or not. Please let me know if you have any questions on this.
Thanks
Shahid Anjum
SAP Basis Admin
Deloitte Consulting Extended Business Services LLC
One Technology Center
100 S.Cincinnati Av, Suite 700
Tulsa, OK 74103-2807