Can't delete steel grade specified by S235

Re: steel class
"yunussacikk":1w0sp1vs" said:
hello, I want to delete my steel class specified with S235, but I cannot delete it.
You cannot delete it because S235 is assigned to sections. First, you cannot delete S235 from the "Sections" section just below Delete existing segments to which ' is assigned, then you can delete S235.
 
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