Read only access to Inquire Project cost

Business users are selecting the wrong business units when loading project cost ADFDIs. Is there a way to prevent a BU from being selected for a particular transaction source within the Project Cost ADFDI if the user has access to inquire on costs for that BU in Project Costs?

For example: If a user has inquire access on the OHIO business unit, but should not be posting costs to that BU, is there a way to disallow that OHIO BU from being available on the ADFDI?