MXApplicationYesNoCancelException not possible in Maximo 7503 Automation script

As of Maximo 7503, we cant throw MXApplicationYesNoCancelException from an automation script.
It is due to the limitation present in the design of Automation script in this version.
http://goo.gl/o013wQ

A RFE is in place to implement it in future release 7506.

http://www.ibm.com/developerworks/rfe/execute?use_case=viewRfe&CR_ID=18101