I recently started working with SW 2005 sp0 and then sp2.
While exploring External References, I created a very simple top-down design by creating a second small cylinder inside of the ID of a larger first cylinder using SW 2005 sp0.
An Inplace mate was created between the two cylinders, by default, as were the external reference symbols (part & assy, feature managers). I then tried to re-create the design with the same design. The inplace mate appears in the assembly, but the external refernces, do not (part or assy).
I loaded sp2, and again could not reproduce the external references or the "list external reference" option (in the drop-down) after right clicking the newly created part within the assembly or the part, as happened with sp0.
I thought that maybe the new 2005 "do not create external refernce" button had been activated or somehow had gotten hung-up.
I don't think the problem is within 2005. Is there a button or option which I've accidently selected or deselected which is preventing the external references from displaying? Many Thanks!