It will depend on the status date setting when you generate the earned
value. If the status date is earlier than the actual finish date, only the
portion of the total BCWP accrued between the task start and the status date
will apply. If the status date is later than the baseline finish date but
earlier than the actual finish date you'll see the BCWS showing the total
fixed cost but the BCWP shows only the pro-rated portion of the total fixed
cost actually spent before the status date. In other words, 100% of the
Fixed Cost was *scheduled* to be spent by the Baseline Finish but it takes
to the Actual Finish to actually spend 100% of it. If the task is going
longer than planned, the fixed cost portion of BCWS accrues faster than the
fixed cost portion of BCWP. If the task take less time than planned, the
situation reverses and the fixed cost portion of BWCP will accrue at the
faster rate.
A concern - BCWP and BCWS both are summing the cost of doing WORK. But with
no resource and thus no work and its associated costs associated with the
summary tasks there is no work to schedule or perform, thus no work or costs
to summarize, and BCWS/BCWP of the summary task are essentially meaningless.
All you're really measuring is the mathematical distribution of the fixed
cost over the task duration, something that is not actually related to the
project's progress at all.
