Hi,
May be the global structures are tables which you used in your method are not transported to the next system. If issue is the test client, execute your method at SWO1 and debug how it is working.
Check the transportation log in your development system. If you found any error, create one more transport and make any small change in your method and try to generate(to reload all the system tables ). Test it and release.
Regards,
Vikram