>Thanks but..
>I use this one:
>index on VAL(right(bp_eng.engkod,2)) + VAL(left(bp_eng.engkod,6)) tag kod

This can't work because it merge two independent dimensions.
If you want a numeric key:

index on VAL(right(bp_eng.engkod,2))*1000000 + VAL(left(bp_eng.engkod,6)) tag kod

>and it wont work.
>The firs tag seems to be OK but the second index tag doesn't. I have sequencies like this:
>00402005
>00401305
>00400805
>but I have no idea why.
>
>Tamas