Since the plan document is a prototype I would suggest you contact the entity that provided the document (UPI, McKay Hockman, PPD, Corbel, etc.). They should have a legal consulting department that should be able to answer the question as it relates to that specific plan document.
If you are unable to go directly to the company that drafted the plan you should be able to go to the company which sponsored the plan document (TPA, CPA firms, broker, etc) and have them contact the appropriate entity.