isis flux_corr question

Hi ISIS users,

I have what may be a simple question but this has been bugging me
for a while.  I'm trying to compute exposure corrected counts for
an energy range of a spectrum, say 1-2 keV (~12.4-6.2 A). 

Within ISIS, it seems like one should be able to read in a spectrum,
arf, and rmf, run flux_corr then do region_counts over the energy
range.  This doesn't seem to work, however.  I get the same counts
value regardless of whether flux_corr has been performed.  Am I
missing something obvious?  Example script below.  Thanks very much!

-Roy

% test
variable e1=12.39854;
variable e2=6.19927;
import("isis");
variable data_id=load_data("source12_corr.pi");
variable rmf_id=load_rmf("source12.wrmf");
variable arf_id=load_arf("source12_corr.warf");
assign_rmf (rmf_id, data_id);
assign_arf (arf_id, data_id);
flux_corr(data_id);
variable b1=region_counts(data_id,e2,e1);  
variable c1=b1.sum;
print(name + "  " + string(c1));
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