Seems to be working as intended for me.

Are you saving a newly created item from the fitting room or did you already save it once and reload it?

If it's a new item then you won't get that dialog the first time you save it. You have to manually edit the cr2 file to point to the correct obj. Then when you load it back into Poser and resave it should give you the option to use the original or save a new one.

It is the same in P12.