Hi,
Situation => I use Contracts for selling Time & Material Services. My employees do Service Confirmations (via Confirm Execution from Contracts). However, I need control on what to Bill customer for and what not to. Currently, am not able to find a simple solution for this. 
I see there is an easy way of doing so in Project Invoice Requests (please see attached snapshot of Project Invoice Request) by using Time Write Off against actual time confirmation.
However, I do not see a similar option in case of Service Confirmation Invoice Request.
Thus, possible way for this is to set in Service Confirmation Approval and then just send the Service Confirmation back to employee and ask him/her to adjust the confirmations.
To me however, this does not look the right solution. My employee did spend his/her 10 hours on the service so, their confirmation is correct. I just need a control on what to bill and what not to bill to the customer.
Also, if they re-adjust their confirmation, how can I correctly capture my costs per Contract, since the confirmations now reflect invoiced amounts rather than actuals? As I understand, Time Sheets cannot be used for Contract based Service Confirmations.
Please feel free to correct me if I missed to understand the way Service Confirmation works for Contract.
Thanks and regards,
Harsh Vardhan Shrotriya