Survey Db Points Sandtrap
The Survey Points UNDO Sandtrap
Civil 3D skills and AutoCAD skills sometimes come into conflict.
AutoCAD Civil 3D Survey is all about the data behind.
In recent Civil 3D 2016-2017 releases the AutoCAD UNDO command works fine for Figures. In older releases it works like Points
This is a step-by-step walk-through how UNDO and OOPS commands can effect Civil 3D Survey Points and change them.
As the post above mentions this is both bad news and good news.
More detailed coverage and a video of Survey Queries can be found in Civil 3D Survey Query Essentials