Possibility of having one Savings Plan available for update, and one not available for update.

We are on PeopleSoft 9.2 with BenAdmin. We have multiple savings plans and they are configured so that contributions can be updated in self-service. The plans are all under the same plan type and there are at least 2 of the options in the benefit programs.

How would I configure one of the savings plans so that it can no longer be updated through self-service while leaving the other plan so that it can? On the benefit program if I uncheck the option to Update Savings Contributions, it disallows updates on both plans.

Is there a way to configure this or will this need to be customized in order to accomplish what we need to do?