I think I got it, my application generates a WDT interrupt, for now. I may have to change it.

in the user manual, says that if the WDT is used to genereate interrupts the device will wake up whenever the WDT underflows. I guess this means that I cannot used the WDT in any power down mode idle, power down or total power down right?
My application requires the micro to run in idle mode 24/7 and power down if it is not being used.