[amibroker] Composite Calculations - help

["Bill" <zim630@xxxxxxxx>]

Hello,
I like to keep composite data on a dozen or so indices.  If I have a 
seperate .afl for each index and run it against a watch list 
containing the components of that index, everything appears to work 
fine.  However, I've recently been trying to have one .afl access 
the different watch lists as such:

if (InWatchList(10)){
list==10;
Comp ="SP-500";

   list = CategoryGetSymbols( categoryWatchlist, list );    
   for( i = 0; ( sym = StrExtract( list, i ) ) != ""; i++ );
}
else
NEXT WATCH List and so on.
I run this against all the stock components contained in all the 
indices. database (TC2007).  I know there is duplication with one 
stock being in more than one index. Again it appears to work just 
fine however, I receive different answers than 
when I run it the first way.  Anyone know why this might be?? And 
what I can do?

Thanks in Advance for any assistance,

Bill