We are the project manager on an NEC4 Engineering and Construction Contract (ECC). One of the changes between the NEC3 ECC and the NEC4 ECC is the wording at clause 17.1 for dealing with ambiguity in or between the contract documents. NEC3 ECC obliged us to give an instruction to resolve the ambiguity, however NEC4 ECC clause 17.1 changes the word from 'instruct' to 'state'. Volume 4 of the NEC4 users guides suggests this change reflects that project managers only have the power to change certain aspects of the contract (e.g. we cannot alter the terms and conditions). If there is no obligation on us to give an instruction to resolve an ambiguity in the scope when using NEC4 ECC, then how does this turn into a compensation event as envisaged under clause 63.10, so that it can be dealt with at the time rather than becoming an issue at completion?