How Do I Create an N.P.C. Only Item? (Boo)

in BG:EE Mods
So I'm stuck on NearInfinity trying to create an N.P.C.-Only Item like Boo or the Rabbit's Foot or Edwin's Necklace or Xan's Moonblade.
How do I create the N.P.C. Only Item Restriction(s)?
How do I create the N.P.C. Only Item Restriction(s)?
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Comments
See Camdawg's guide here: http://gibberlings3.net/forums/index.php?showtopic=25516&p=212259
Not correct, I have tried that
Although I'm working with what I got and I'm getting an '80% satisfactory rating' with my plans vs my results.
Although I would LOVE to work with the Enhanced Edition Engine and its externalized features.
[It was so frustrating and disheartening to find the string reference in NearInfinity of Edwin's inventory message when you try to remove his necklace only to come up just barely short with engine limitations.]
If this is for a mod, you can either make ToBEx a prerequisite (for non-EE games) or, even better, incorporate the relevant portion of ToBEx in your own mod (in fact ToBEx is redistributable).