Looks likes C4R and shared coordinates dint mix:


Good ol Steve Stafford to the rescue

Yes, shared coordinates is tricky because Publish Coordinates isn't allowed in the C4R environment. It may never be either because it's the only operation that Revit allows to alter a linked file directly. In the C4R world, behind the scenes, there isn't a project file in the way we think of them as discreet things.

In the past I've written and recommended an approach that involves Acquire Coordinates (AC), which does work but if the models have to move again later is tedious to reconcile. We have to stop disable shared coordinates with the source model, AC from another Fake File and then repeat the AC process to reestablish it with the new building positions.

It's a little more straightforward if we just adopt a process using Specify Coordinates at Point (SCaP) instead. We have to provide markers to position and align the models accurate with each other. Once positioned properly using SCaP defines the survey coordinate relationship so any exported data will line up with each other elsewhere later. If the buildings move then move them and reuse SCaP to redefine the relationship.

Neither approach will just fix themselves when the site relationship with the building(s) changes...tedious no matter what. The SCaP approach might be perceived as a little simpler...the more changes there are and the more buildings and trades that are trying to line up their work.