Pension plan investments

[Gary]

a one participant plan has invested in art work.

To my knowledge such an investment has always been permitted.

A person said that there is an IRS ruling (fairly recent) that now prohibits such investments. Actually I would expect it to be a DOL ruling if anything.

Does anyone know of any rulings that prohibit such investments or changed the rules regarding these types of investments?

Are we in agreement that investing in art work (especially for a one person/owner plan) is permitted?

Of course the plan I am referring to is not an ERISA plan as there are no employees.

Thanks