st: xi command deletes variables without warning

["Thuy Le" <tl6775a@american.edu>]

I have a panel data set with about 20 variables and less than 700
observations. I used the following command in STATA9 SE 

.xi, noomit i.region i.income

to generate the dummies and it work fine. I saved the file and when I used
the command again with the same command for another variable

.xi, noomit i.interval

STATA somehow deleted some of the previously generated dummies. 

I used another command with no problem

.qui tab, gen(interval_)

Is there anyone experienced the same problem?

Thuy Le



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