Probably AUTO property is set to True. Make sure it is False:

with thisform.MSChart1.Plot.Axis(1,1).ValueScale
   .auto=.F.
   .Maximum = WHATEVER
ENDWITH

>Hi Yuri, thanks for your post which shows what the current values are. Is there a way to set the value? I try to set the Maximum but it has no effect.
>
>>David,
>>Try something similar to this:
>>

>>with thisform.MSChart1.Plot.Axis(1,1).ValueScale
>>	lcmes=lcmes+"Auto: "+TRANSFORM(.Auto)+CHR(13)+CHR(10)
>>	lcmes=lcmes+"MajorDivision: "+TRANSFORM(.MajorDivision)+CHR(13)+CHR(10)
>>	lcmes=lcmes+"MinorDivision: "+TRANSFORM(.MinorDivision)+CHR(13)+CHR(10)
>>	lcmes=lcmes+"Minimum: "+TRANSFORM(.Minimum)+CHR(13)+CHR(10)
>>	lcmes=lcmes+"Maximum: "+TRANSFORM(.Maximum)+CHR(13)+CHR(10)
>>endwith
>>
>>

>>
>>>Hi all, I'd like to set the maximum value of the vertical axis (y-axis) of a MSChart to a certain value. Couldn't find much documentation about this and so I try guessing and set the following to try set the maximum Y to 1000:
>>>
>>> oCHART.Plot.Axis(1,0).ValueScale = 1000
>>>
>>>but it doesn't work. Any suggestion?
>>>Thanks!