Nibal,

When this happens, you can click the Runtimes button, to generate the valve firing sequence, which should help track down the issue.
It could also be either your Units, or perhaps a UCS or something -- I'm thinking the green chart line is off in the distance or something.

--J

Jeremiah,
it was a matter of different UCS eventhough i genereted all the other schedules in the different UCS and ther were all fine..
i worked around it and needed to generate it in the normal UCS and change the UCS in the view port..

but any further information why this schedule in specific is affected by changing the UCS..

Thanks,
Nibal

Many thanks Jeremiah..

Nibal