Found

[IChoseThisName]

<3 Got it.

[Belzader]

Why do you need that, to my knowlegde they can be sold same way as normal horses (require them to be in the family though).
So if your looking for something if they're not or to be able to buy one, that's a diffrent thing.

[IChoseThisName]

Uh, no. Unicorns do not allow themselves to be sold like regular horses. Nor bred or sired or put up for adoption. If you know something I don't, then share your knowledge, pray tell. As of now I'm unable to find a mod that enables equestrian center options for unicorns. This would be helpful.

[Belzader]

Be damned your right, i had all the options but since i use quite few mods, i removed all and it was like you said.. now to find which mod that alow it....

[twallan]

Could be [Woohooer] unlocking that capability. It performs some alterations regarding the Equestrian Center interactions. :)

[Belzader]

Yep, it's [Woohooer] but errm, unless OP don't want all the other things it does, i think she have to live with that they can't be sold.
Anyway to check it out, click on link in twallans signature

[IChoseThisName]

Could be [Woohooer] unlocking that capability. It performs some alterations regarding the Equestrian Center interactions. :)
Thanks, twallan! I already use a bunch of your stuff. <3