Does anyone out there have refundable security deposits?

For example, we have a organization renting part of our building. We can invoice them for each item used, but do I need to build in a "Security Deposit Item" and then refund it when the event is over, or is there something that is designed within the system for this type of action?

@Micah Timbol-Oracle, I'm unable to edit the original message. The answer was by no means a solution for the question. In addition, it appeared sound, but I didn't test it because I do not have that use case at the moment. My original issue was concerning customers that I am adding a Security Deposit to their Sales Order/Invoice. I lamented that I have over 400 orders annually that I must use a work-around.