I've received a reviewer's feedback stating that "the required back-check Design review occurred after the date for beginning of construction...Provide a narrative explaining the sequence and schedule for the implemented Cx services, along with supporting documentation verifying that the required back-check by the CxA of the Cx review comments occurred in the subsequent design submission and prior to the completion of construction documents ".

At the same time LEED reference guide states that the back-check design review must be conducted before mid-construction documents.  My understanding is that the "mid-construction documents" are developed during construction, after completing the concrete skeleton and before starting with systems and interior works, which are assigned to a different contractor in my case, additionally; the mid construction is during construction (by definition) and not before it, so how can I conduct mid construction review before it?  Anyone has more explanation to that, or can provide guidance on replying to USGBC, that would be very helpful.

Thanks in advance...