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st: strange error with stata10 and 9 using by

To   statalist <>
Subject   st: strange error with stata10 and 9 using by
Date   Mon, 23 May 2011 04:24:39 +0200

Dear statalist ,
I have a very strange error when I run the do file with stata 10 and 9
 for example see the code below . The first variable is generate the
second one not, if I eliminate" by codind"
still to work. I don't understand what happen.
thanks in advance

 sort codind fechalta fechabaja
by codind : gen coin=1 if fechalta>fechabaja
drop if coin==1
(64329 observations deleted)
by codind : gen coin1=1 if fechalta==fechabaja
drop if coin1==1
coin1 not found

gen coin1=1 if fechaalta== fechabaja
drop if coin1==1
(300 observations deleted)
drop coin1
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