I think that's because at the bar where you ask highervalue you're 
at the highest bar since first bar loaded
and vice versa for lowerbars
stephane
> 
> please, look at the attached gifs. Why scLOWERVALUE() and 
scHIGHERVALUE() functions sometime are empty?
> 
> Thanks in advance and best regards,
> 
> Franco
 
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