Civil 3D Trimble Link Road export tip. Feature lines unchecked. Point empty coding.

When exporting a Civil 3D Corridor to a Trimble sensor using Trimble Link the apropriate Corridor Surfaces must have already been created.
But no Cross Sections will be exported if Surface is created through Links that the Feature Lines at the two edges of each Link are not checked !
This also means that uncoded points can not create a Trimble Link exportable surface !