Change theme in global settings applications

Hi,

I trying to change the global application parameters in the application  WD_GLOBAL_SETTING to change the theme of all the webdynpro abap applications, but whenever I change the value, the value is getting changed and corresponding theme is applied, but the issue is that it is not asking for a transport  request, whenever there is a change in the value of a parameter in this application.

Can you all suggest on how to change the existing theme SAP_CORBU to sap_tradeshow, which would create a transport request and can be transported to higher landscapes.

Regards,

Madhav