Deleting standard layers by macro

[Regina Henschel]

Hi all,

if you use a macro, you can delete a standard layer. When you save the 
document, close it and reopen it then, the standard layer is recreated. 
As expected it is empty.

Is a macro developer expected to take care himself of not deleting 
standard layers, or is this a bug and LibreOffice should prevent it 
either way?

Kind regards
Regina