How do I show an Oracle Form block name?

I have a complicated Oracle Form (our version of Sungard’s SSASect) and am getting a weird error (FRM-92101). I have put messages into all the pre-block and post-block triggers I can find to trace how control passes to the error. Unfortunately the trace shows that 3 times Form-level pre/post-block triggers are invoked. I would like to know just which blocks these are, and I have quite a choice. How can I get the message to show the current block’s name?