Regarding CCU8 example project(AP32288) for XMC4500

I have one question.

I found CC8 example project for xmc4500 at your web site.
http://www.infineon.com/dgdl/Infineo...4ed8e64764187f

I'm confirming the behavior of Period match interrupt and one match interrupt using use case No3 of this example.
I build this project and program via debugeer,after that I insert breakpoint at code of period match interrupt routine and start it.
But debugger don't halt at this breakpoint.....
I changed this break point at code of one match interrupt routine.
In this case,debugger halt at this break point.

Could you please advice me why this CCU8 timer doesn't interrupt at period match interrupt routine!