I have a dozen tasks as predecessor to a finish milestone.
One of the predessor tasks is critical and driving, with
-57 days' float. with only one successor, however, the
milestone shows -243 days' float. When I remove the
predecessor with -57 days' float, the milestone's total
float goes to +5.
I know there's
an easy explanation, but I can't think of it. Someone hit
me over the head with it, please....
Just guessing at all possible things to try out:<br
1. Any external relationships?<br
/>2. What about retained logic for predecessors of
the removed predecessor etc.?
version of Primavera? Are you on the latest
Float is kind of tricky here. You will have odd float
(negative) if you applied a constraint to the
activity. this will appear for example when you have a
finish on or finish on or before type constraint and
Primavera calculates that you will not be able to
finish on time. Your negative float value indicates
how far past the constraint your activity wants to
push to. Aslo, LOE activities will throw you off here.
It is my opinion that you leave LOE activities untied
with thier successor relationship to keep them off CP.
There are two primary causes of negative float on
1. If a Must Finish By
constraint is assigned at the project level, this
could cause negative float if the project cannot be
completed by the constraint date. Check the Must
Finish By date in Projects View, Dates tab.<br
2. If a mandatory constraint is
assigned to an activity, this could cause negative
float if the predecessor activities do not have enough
time to finish. Run a schedule report to check for
sources of negative float:
Out of sequence
progress. Correct the logic in the schedule or
schedule using Progress Override or Actual Dates.
Different Calendars on activities. <br
/>External project(s) with constraints that have
relationship ties to the schedule. Check the Advanced
Scheduling option "Ignore Relationships to and from
Reschedule to remove the leveling
/>If you have any further questions please contact
support at Support at