The following error is displayed at the bottom of the irregular cross section dialog: Stations should be in ascending order
It is seen particularly when you are defining two entries for elevation (relative) for a single station and the cross section editor reads a single elevation for a single station.
If you want to enter two elevations for a single station enter the first as 00+01 and the second as 00+01.01. This way the software will read the elevations correctly since they have slightly different stations.
Error message when validating model: "Elevation (Relative) values within the Irregular shape definition must be non-negative."
Modeling non-standard conduit or channel shapes