No offense, but it's questions like this that make me want to go back into private practice specializing in correction of plan operational errors....
The short answer is "yes, but...." Potentials for errors in mis-characterizing an employee's classification, mis-calculation of required service for that class, problems when one changes job classification (say, a teller works 4 months and is in, but then moves to a job that requires 6 months to be eligible)., testing issues and the like. We have problems with just dual eligibility requirements (deferrals and match) or with "part-time" (one year, 1000 hours) and "full time"(something less than a YOS). Getting more specific just makes the plan that much more difficult to administer.
Before getting into the weeds, what exactly is the plan sponsor attempting to accomplish with such a situation?