Adapter Module development : Reporting the message in RWB

Hi,

What is the way to change the error message that gets reported in RWB , when we select a perticular channel in communication channel monitoring, via adapter module?

I am able to write Error messages to Audit log but if any exception occurs, but the initial channel monitoring screen always reports error as

Error:null

I want to report the error on that screen as the same is reported in Adapter engine alerts and due to this, all my alerts have the container SXMS_TO_ADAPTER_ERRTXT always filled with value

Error:null

Any clues?

Rgds,

Amol