Coordinate System
Drawing|Misc|Coordinate system
Survey|Coordinate system
Terrain|Coordinate system
Point cloud|Coordinate system
Net Adjustment|Coordinate system
Geometry|Coordinate system
The document can use a specific coordinate system. When importing data to a drawing, a warning will appear if the drawing you are trying to import to uses a different coordinate system.
This will not change the coordinates themselves but is used for transformation of WMS maps and is part of net adjustment calculations.
In the Survey document selecting a coordinate system will activate Corrections for Projection and Ellipsoid based on the definition on the Coordinate System.
See also
System settings - Coordinate system.