Can we click the button by Siebel Scripting

I am writing one BS,in which I need to submit one document in Service Request.

There is one button on Service Request Attachment Applet named 'Submit' . I need to click this button by Scripting(by the BS).

Is it possible? I tried to do that by,

bcName.InvokeMethod(TheMethodNameOnButton);

But I am getting the error "The specialized method --is not supported on Business Component 'Service Request Attachment' used by Business Object 'Service Request'.(SBL-DAT-00322)'

I have properly written the statement as  return(CancelOperation); too.