I've got [TUI-61] when using define_clock

[ppc]

Let say I want

period = 100 ps
rising @50 ps
falling @100 ps

I use:

*********************
define_clock -period 100 -name abc -rise 50 -fall 100
*********************

I've got:

*********************
Error : Value is too large. [TUI-13] [define_clock]
: define_clock -fall option (100) must be less than
-divide_fall option (100)
Failed on define_clock -period 100 -name abc -rise 50 -fall 100
*********************

How can I define this clock?

Thanks,
Peter