ReCap should let you assign Coordinate Reference System to RCP projects that have not defined coordinate system on their properties (at least when the project uses the same units as the desired coordinate system).
That because some softwares export to RCS and RCP but do not assign the coordinate system to those files, but export the X, Y and Z value as the proper coordinate values; as ReCap open these files you can register the RCS but you have no option to go to Advance Settings where you define Decimation or the Coordinate System.
Also, existing RCP let you see "Not defined" coordinate system in property of the project, but when you try to assignate one (that matches with the units), an error message pop up on ReCap.
We need a Coordinate System to properly link the RCP file into Revit by shared coordinates, an also to place by coordinates on Civil 3D. In civil 3d you may import to the 0, 0, 0, or origin, with practically no issues; but in Revit you should not try to insert long coordinate files far from revit internar origin or 20 miles limits generate issues in the project.
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