(1) Explain your problem, don't simply post "This isn't working". What were you doing when you faced the problem? What have you tried to resolve - did you look for a solution using "Search" ? Has it happened just once or several times?
(2) It's also good to get feedback when a solution is found, return to the original post to explain how it was resolved so that more people can also use the results.
activites that have exteranl relationships will have an asterick in the start date column
Option 1 go to tools schedule
select options
then select ignore relationships to and from other projects
option #2
filter for all activities
right click columns
expand the dates availability on the left and choose
External Early Start and also choose External Early Finish
now in the External Early Start column Blank out the dated
now do a fill down a
Now do the same thing for the External Early Finish Column
Option #3
go to tools
global change
New (on the right)
Where (leave this line blank)
then
External Early Start = (leave the rest of the line blank)
and
External Early Finish = (leave the rest of the line blank)
then on the right select change
then commit changes
what ever option that you choose make sure to run the schedule calculations after you run your option