Delete Entity XData

You can use the Delete Entity XData function to delete extended entity data. These are data, which are stored on entities within the drawing when you use the Connect Polyline to Road or Cross Section Library functions. If you wish to connect a polyline again, you can use this function to delete the registered data for this line. You can read more about extended entity data in AutoCAD ADS Programmer's Reference Manual.

Find the function here:

Ribbon: Bridge > Delete Entity XData