During the implementation phase unexpected circumstances may call for variations of the initial conditions under which the contract was undersigned and the project proposal validated. This means that contracts may need to be modified during their duration if the circumstances affecting project implementation have changed since the initial contract was signed.
Modifications to the contract must be made by means of an Addendum to the Grant Contract. Such Addendum must be signed by both contracting parties.
The EC sets general conditions regarding modifications, which should apply for all types of contracts:
To the extent that EU or EDF financing is sought, any modification extending the period of implementation must be such that implementation and final payments can be completed before the expiry of the Financing Agreement under which the initial contract was financed.