Determine if a uniquely keyed logical exists for a given physical

I've got a physical file that was defined without a unique key.

Is there some way to tell if some logical over that physical has a unique key?

Of course I could always do it the hard way:
1) Look at the source or the DSPFD output for every logical
2) Try to write some duplicate records.

But I'm wondering if there's someplace on the system that tracks if a physical 
file has some unique key defined somewhere.

Thanks,


Charles Wilt
iSeries Systems Administrator / Developer
Mitsubishi Electric Automotive America
ph: 513-573-4343
fax: 513-398-1121