Basil,
The transmit screen sometimes is too fast to see what gets displayed. Don't you rather save your data on the properties of an object (could be temporary) and display it on your actual mobile app?
The messaging system normally displays error or main application steps. If there is an area where it gets controlled it may be under the localization files but again the transmit screen may be too fast and it will disappear after transmit. So it is still better to just populate the returned value into a screen for display later.
In some applications, the users do not want to see the transmit screen (option to turn off in the editor) as they do not care about the details of the transmit and they are only users or technicians or sales people. So the transmit screens gets turned off for most of the customers that we have. So you will see a busy icon instead during transmit.
Also the localization file of Agentry like clientText.ini controls what gets displayed to the screen. It is normally controlled (pre-defined).
Best Regards,
Mark Pe
SAP Platinum Support Engineer