I suppose there is somewhere something in your template that uses this linetype.
I do not believe you can delete the OOTB Styles
Why, in god's name would you want to delete the ability to have hidden lines?
Possibly because they want to define a different custom spacing format. Then remove the supplied style and name new style hidden.
I would very much like to be able to remove some of the stock dimension styles, not allowed to do that though. Big Brother doesn't allow that !
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