In your Option E ECC compensation events are assessed using Defined Cost plus Fee with Defined Cost being a defined term at clause 11.2(23). So for Subcontractors, Defined Cost is "the amount of payments due to Subcontractors for work which is subcontracted without taking account of ...". The Schedule of Cost Components (SCC) is irrelevant as Subcontractors do not appear in it. If the PM disagrees with a cost they have to be able to class this as Disallowed Cost a defined term under clause 11.2(25) with the relevant part being "should not have been paid to a Subcontractor or supplier in accordance with his contract".
If your subcontract incorporates rates then provided the Shorter Schedule of Cost Components (SSCC) was modified accordingly (or they were incorporated some other way) it should be fine to use them. However if the rates were incorporated without amending the SSCC (or some other way) then you are correct that the method of assessment is based o the actual amount paid to people by the Subcontractor plus WAO% and Fee. You should get the Subcontractor to give you a build-up in accordance with the SSCC and if they refuse make an assessment yourself. If you've already paid the Subcontractor incorrectly (i.e. using the agreed labour rates without an amended SSCC, then you should correct this in your next assessment of the amount due to them.
Under your Option E ECC there should be very little risk for a Contractor, you shouldn't end up in a situation where you're paying a Subcontractor £X and the Employer only paying you £Y.
If your subcontract incorporates rates then provided the Shorter Schedule of Cost Components (SSCC) was modified accordingly (or they were incorporated some other way) it should be fine to use them. However if the rates were incorporated without amending the SSCC (or some other way) then you are correct that the method of assessment is based o the actual amount paid to people by the Subcontractor plus WAO% and Fee. You should get the Subcontractor to give you a build-up in accordance with the SSCC and if they refuse make an assessment yourself. If you've already paid the Subcontractor incorrectly (i.e. using the agreed labour rates without an amended SSCC, then you should correct this in your next assessment of the amount due to them.
Under your Option E ECC there should be very little risk for a Contractor, you shouldn't end up in a situation where you're paying a Subcontractor £X and the Employer only paying you £Y.