Hi Imany,
The fastest way is to ask the developers of the AUT if they are using the GXT RPC proxy.
If this information is not available, then you will need to look at the WAR file and the traffic.
If the WAR file contain the GXT jar (in WEB-INF\lib) then the application uses GXT
Then in code generation log, you need to locate the requests that was not converted, if it contain a BASE64 value.
Kind regards,