I have a custom entity with a field that needs to accept either a user or a contact. I know how to do create a field to accept a user and to create a field to accept a contact. However, how do create one where I can select a user or a contact?
Thanks
This can't be done natively, but here is a solution using javascript:
http://www.simonjackson.info/blog/2010/02/crm-4-multi-entity-type-lookup.html