Recalculate Raw Cost

We are on R12.1.2 - Project Costing/Billing

I am trying to recalculate raw cost on an item.  The "Recalculate Raw Cost" is greyed out.  The "Recalculate Raw Cost/Revenue" is available.

I notice other items where "Recalculate Raw Cost" is still available.  When does the system no longer allow you to recalculate cost only?

What are the implications of recalculating both?

My goal is to fix a problem with items going to the wrong cost account.  My idea is to change the SLA rule, mark the item to recalculate and rerun the processes to correct the accounting.

I don't want to do this if revenue will be affected.