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I got a lot of surfaces that are not in my PLN project and i delete them.
All good until i open AC again, they are still there.
Where are these missing surfaces actually? How to delete them FOREVER?
PS: On the linked library only AC26 and MEP26 library are loaded.
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As they are underlined, it means they are coming from a MASTER_GDL object in a loaded library.
If you only have those standard libraries loaded (I don't think there is anything in there), I would have a look in your Embedded library as well.
Every time you reload the libraries, the MASTER_GDL object will re-create the attributes, so you can't delete them permanently until you delete the MASTER_GDL file.
Also as the are RAL surfaces, do you have an RAL goodie (add-on) loaded?
As you said, it was something in the embedded library that after i deleted them they didn't reappear.
PS: No i don't have RAL libraries.