XS_ENABLE_REBAR_MARK_LEADER_LINE_BASE_POINT_OPTIMIZATION was set to
TRUE, Tekla Structures optimized the base pointpoint in a model that is used to define a starting point in surveying and that is used as an anchor point in coordinate and height transformations
A Tekla Structures project can have several base points but only one of them can be the project base point.
Base points allow the use of another coordinate system needed for interoperability and collaboration. Base points can also be used in drawings, and in reports and templates. Model origin is the default base point in Tekla Structures.
Base points are also called control points.
location after you manually dragged the base point into different location. Therefore, in some cases, the base point would move to a different location than the location you dragged it to.