How do I fix a missing Perl module that YaST tells me is installed (but it is not)?

I have a pretty fresh install of SLED 11 SP 4, and don't have an older date handling module I used to use. That's OK, I'll use something else. I see in my list of installed modules, YaST tells me I have the module Date::Manip (version 5.54-2.21 by Sullivan Beck)

When I try to use it though, Perl gives me the error "Can't locate Date/Manip/" and all the paths it searched. Indeed, find / -mount -name does not show the module installed where the YaST File List says it ought to be.

Is this something I can fix?