Restrict purchasing on a product to a role

[David Warburton]

Dear Ofbiz users,

Can someone advise what might be the best way to accomplish the requirement
of having a product that can only be purchased by a logged in party that has
a certain role?  I can see the page that allows to associate a product to a
party, but i would really rather associate the product or product category
with a role.  Any advice?

Thanks,
David Warburton