error 500 while enabling REQUIRES

[Tim Schaub]

> 
> Hi there:
> I have a problem, when I turn on REQUIRES in a layer I 
> receive a Internal Server error 500. everithing works fine 
> when I comment the line.

REQUIRES doesn't work on layers with NAME or GROUP (named or grouped
layers) between 4.2 and 4.8 - see bug #1283:
http://mapserver.gis.umn.edu/bugs/show_bug.cgi?id=1283

At 4.8 (and beyond?), REQUIRES still will not work for rasters.

Tim