Yeah it's a pretty typical chain of products. Although in many cases there are other products that come in from another area.

1st -> 2nd -> 3rd
/\
¦
4th---->5th----


The connections I'm using are finish to start already. The problem being if I change the end date on 2nd or 5th task in the above example, the task gets pushed forward rather than the duration changing, despite the fact that it did usuall start on the same date.

edit: ASCI fail. The line fromt he 5th task should be leading up into the 3rd task. Can't get it to format correctly.