I am doing an update for which one activity needs to finish on May 2nd and its saying remain finish cannot be earlier than remain start. Remain start is May 17 and I manually tried to change it but it's going back to May 17. What to do. Please help need it right away.
Remain early start and finish
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look at its predecessor that is making the remaining start May 17th then if the logic is not correct then change it.
Lets say you have 2 activities A and B both 10 days duration and they are linked by a FS relation A to B
if A gets an actual start and has a remaining duration of 2 days and B somehow gets started (prior to A finishing) and B has a remaining duration of 3 days then the LAST 3 days of activity B CANNOT begin until the late 2 days of A is finished.
As Rafael pointed out this is out of sequence logic because B did NOT wait until A was done to get started. However the default RETAINED logic locks in the remaining duration honoring the FS relationship.
It looks like you have an out-of-sequence occurrence. In such case a fix on activity logic might be needed. If any logic fix is needed I would try any changes in a separate file and then make the adjustments on the file you use for management of the schedule. You might need to add a second activity, finish the original, transfer remaining costs to new one and any other changes as necessary.
Good Luck,
Rafael