People Costs under NEC4 Accommodation & Subsistence Costs

We are working on a NEC4 Option A contract on a project overseas.
We have submitted numerous CE’s relating to additional works & delays which have been agreed and implemented.
The project has been on hold for 12 months and recently we have submitted further quotes and included costs for labour and associated accommodation and subsistence which is now being challenged as being non recoverable.
In the contract under the SSoCC we have provided our day rate for labour and expressly excluded the costs for travel, accommodation and subs from the rate as they can vary.
We have then based these other associated costs based on actual costs plus our fee.
Is this correct?