Negative Lag Link to Task STart

[Guy Montgomery]

Hi,

I have the following problem, which I have not been able to
solve via project help.

I have a milestone, call it MA, followed by a Task, call it
TA. TA is linked to MA with a finish to start link with a
+20 lag. I then have a second milestone, MB, which is a
delivery that needs to occur 4 days before TB can start. I
can't figure out how to link MB to task A to allow MB to
move automatically due to changes in MA.

I could achieve the same effect by making MB follow a
finish to start link from MA with a lag of +16 days. But
the problem with this is that if I want to change the lag
between MA and TA, I also then have to remeber to change
the lag from MA to MB. If I can have a link with negative
lag between TA and MA then things will work out OK.

I have tried using a start to finish link between TA and
MB, but project complained that the link would violate a
constraint, i.e. it thinks MB is constrined somehow. I have
no constraints entered.

Thanks.

 

[Guy Montgomery]

Hi,

Correction to my post - when I say "4 days before TB can
start" I meant "4 days before TA can start",

Sorry.

 

[Steve House]

If I understand you correctly (a "TB" suddenly appeared in your explanation)
try this:

Tasks
Milestone MA
Milestone MB
Task TA

Links (predecessor listed first)
MA->TA FS+20d
TA->MB SF-4d

TA starts 20 days after MA, MB occurs 4 days before TA and if MA moves back
and forth, both TA and MB move with it, MB always occuring 4 days before TA.

 

[Guy Montgomery]

Hi,

Yes, sorry about TB it was a typo by me.

I tried your suggestion and it seems to work fine. I
thought I had tried this and kept getting an error about
not being able to change the date, but I must have been
doing something subtly different,

Thanks again.