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How to delete polygon in Allegro 16.6 PCB Editor

Kabal

 Sounds simple, but it just does not work. Maybe some switch has to be turned on for that or anything else? It is amazingly non-intuitive!

 There is some polygon on TOP layer for the Etch class. I select it, menu pops up where I can assign color to it etc, again..means its selected, and nothing else is. I press Ctrl+D, or Select Delete from Edit menu, in the bottom it says something like:

Selected item not valid for current operation, ignored: Net "N05231"
No valid items selected for the current operation, exiting.

 

BUt how come not valid? I just want to delete it, I tried several modes, Etch edit mode, general edit modes and others, same thing!

...I'v used several PCB design software packages already, its the first time I come up with such a thing in Allegro.. any idea what am I missing?  (maybe I turned something on/off and for some reason it just ignores my request to delete object? I have no idea..)

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