No, I don't think this is reasonable. You can argue that the ECC is a bit light in terms of explicitly stating that what has to be shown in a quotation with the Short Form (ECSC) being explicit.
However, given that the contract gives a breakdown, I think it is reasonable to infer that the breakdown should be to the same level as the contract.
Regardless, not accepting a communication because more information is needed in order to assess it fully and giving "sufficient detail to enable the Contractor to correct the matter" i.e. what extra detail you require (all as per clause 13.4) is not a compensation event.
However, given that the contract gives a breakdown, I think it is reasonable to infer that the breakdown should be to the same level as the contract.
Regardless, not accepting a communication because more information is needed in order to assess it fully and giving "sufficient detail to enable the Contractor to correct the matter" i.e. what extra detail you require (all as per clause 13.4) is not a compensation event.