I used to modify shape with Command "shape edit boundry" .
But sometimes I find this command invalid.
For below instance, it is just a GND shape at GND PLANE.
When I using "shape edit boundry" command to modify shape vertex, it is invalid randomly.
I say it "random" because it can be work sometimes and it cannot sometimes.(I always try to operate on vertex point intentionally )
I can not summarize any rules between them.
My quesiong is: Is there any special notice or regulation with this command which I have not aware it?
This could be because your editing results in a Shape Boundary that crosses itself. Try a Database Check as the first instance in case there is "something else" in the database that is related to you Shape editing.