Exception Handling Problem In BPM

All

I am facing an exception handling problem I am using BPM and , I have caught exception in the transformation step but when there is any data problem in that mapping(mentioned in the transformation)

it is not throwing the exception . is there any option to collect these type of system exception in the bpm and give a alert thru mail

is there any way to collect these type of exception happened in the BPE and raise alert thru generic alert

Thanks

Jayaraman