Secondly the error that you are getting now, that is "REVMGR-20728:rates and costs are both missing for one or more roles/resources", is just because all the team members that you have added in the investment are not having Rates/Costs in the current Rate Matrix.
To take care of the same, you have to first check, what the Rate Matrix that is mapped with the Investment. Then by gong to the "Manage Matrix" page, you have see if there are rows which are suiting all the team members of the investment. If you need further help on this and articles that are already provided to you is not helping, it is better to raise a case with CA Support.