 a description of the tasks, if any, to be performed or the measures to be taken and a  programme of implementation of the tasks;   any necessary amendments to the programme of implementation of the tasks or to  any of the contractor's obligations resulting from this contract; and   any adjustment to the total contract price in accordance with the rules set out in  Article 22.  22.6. Following the receipt of the contractor's submission referred to in Article 22.5, the project  manager shall, after due consultation with the contracting authority and, where  appropriate, the contractor, decide without delay whether or not to accept the amendment.  If the project manager accepts the amendment, it shall notify the contractor through an  administrative order stating that the contractor shall carry out the amendment at the prices  and under the conditions given in the contractor's submission referred to in Article 22.5 or  as modified by the project manager in accordance with Article 22.7.  22.7. The prices for all amendments ordered by the project manager or the contracting authority  in accordance with Articles 22.4 and 22.6 shall be ascertained in accordance with the  following principles:   where the task is of similar character and implemented under similar conditions as an  item priced in the budget breakdown, it shall be valued at such rates and prices  contained therein;   where the task is not of a similar character or is not implemented under similar  conditions, the rates and prices in the contract shall be used as the basis for valuation  as far as is reasonable, failing which the project manager shall make a fair valuation;   if the nature or amount of any amendment relative to the nature or amount of the  whole contract or to any part thereof is such that, in the opinion of the project  manager, any rate or price contained in the contract for any item of work is, by  reason of such amendment, rendered unreasonable, the project manager shall fix  such rate or price as he thinks reasonable and proper in the circumstances;   where an amendment is required by a default or breach of contract by the contractor,  any additional cost attributable to such amendment shall be borne by the contractor.  22.8. On receipt of the administrative order, the contractor shall carry out the requested  amendment according to the following principles:  a) The contractor shall be bound by these general conditions as if the amendment  requested by administrative order were stated in the contract. b) The contractor shall not delay the execution of the administrative order pending the  granting of any extension of time for completion or adjustment to the total contract  price. c) Where the administrative order precedes the adjustment to the total contract price,  the contractor shall keep records of the costs of undertaking the amendment and of  the time expended thereon. Such records shall be open to inspection by the project  manager at all reasonable times.  22.9. The contractor shall notify the contracting authority of any change of bank account, using  the form in Annex V. The contracting authority shall have the right to oppose the  contractor's change of bank account.  August 2020 c4e_annexigc_en  Page 18 of 36 