John
Tue Jul 25 10:07:18 CDT 2006
In article <AAD9219D-65AE-4CAF-B99A-1CF15DA08265@microsoft.com>,
John Boy <JohnBoy@discussions.microsoft.com> wrote:
> We need to manage a link between two tasks with a hard constraint. At a set
> time from start of first task we need to start another task. We CAN simulate
> this by using a negative lag finish to start link. If the first task is re
> scheduled / start date changed subsiduary task keeps its relationship. But if
> the subisudry task is rescheduled out (to the right) relationship is not kept
> i.e. the negative lag is only constrained in one direction. This means the
> relationship can be broken by mistake.
>
> John
John,
First of all it doesn't sound like you have a hard constraint. A "hard"
constraint is something like "must start on" or "must finish on".
Perhaps what you want is a hard link relationship that will allow an
adjustment to the start of either task to move the linked task. Project
does not support that type of link but you could try the following
workaround.
Let's say the tasks are 1 and 2 and you need the second to start 10d
after the start of the first task. First set up a Start milestone. Link
task 1 in a simple finish-to-start relationship with the milestone. Link
task 2 as: [milestone ID]ss+10d. Now, don't mess with the start date of
either task, instead adjust the milestone date as necessary. Both tasks
will move in unison while the delay relationship is maintained. Perhaps
not exactly what you want, but it will get you there.
John
Project MVP