OGRSpatialReference Datum behavior

[Ben Discoe]

Sorry about the rash of feedback, but it's been an exciting day of porting
to OGR.

I'm experiencing an odd behavior:

OGRSpatialReference sr;
sr.SetWellKnownGeogCS( "NAD27" );
sr.SetUTM( 10, TRUE );
const char *datum = sr.GetAttrValue("DATUM");

This returns not "North_American_Datum_1927" as expected, but NULL. It is
correct if i don't call SetUTM. Somehow the call to SetUTM is wiping out
the datum. Bug?

Thanks,
Ben