I suppose there is somewhere something in your template that uses this linetype.
I do not believe you can delete the OOTB Styles
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 !
Gary Dinges | Mechanical Design Engineer II | Probes & New Product Development Emerson Commercial & Residential Solutions | Therm-O-Disc, Inc.| 1320 South Main Street | Mansfield | OH | 44907 | USA T +1 419 525 8554 firstname.lastname@example.org