Why do linked .sldlfp sketches used in parts no show up in where used in pdm? I created a part by inserting a sketch saved as a .sldlfp file. I selected the link to library part. After checking the extruded part file in PDM (SolidWorks PDM Professional 2017), I selected the original .sldlfp file an went the where used tab, and the saved part file does not show even if showing all versions and levels. I cannot edit the sketch in the part since it says that the item is owned by a library feature that is linked to its parent. Does this only work if the library feature is a .sldprt part model?