31.3. Should exceptional circumstances make it impossible to proceed with the acceptance of  the supplies during the period fixed for provisional or final acceptance, a statement  certifying such impossibility shall be drawn up by the project manager after consultation,  where possible, with the contractor. The certificate of acceptance or rejection shall be  drawn up within 30 days following the date on which such impossibility ceases to exist.  The contractor shall not invoke these circumstances in order to avoid the obligation of  presenting the supplies in a state suitable for acceptance.  31.4. If the project manager fails either to issue the certificate of provisional acceptance or to  reject the supplies within the period of 30 days, it shall be deemed to have issued the  certificate on the last day of that period, except where the certificate of provisional  acceptance is deemed to constitute a certificate of final acceptance. In this case, Article  34.2 below does not apply. If the supplies are divided by the contract into lots, the  contractor shall be entitled to apply for separate certificates for each of the lots.  31.5. In case of partial delivery, the contracting authority reserves the right to give partial  provisional acceptance.  31.6. Upon provisional acceptance of the supplies, the contractor shall dismantle and remove  temporary structures as well as materials no longer required for use in connection with  the implementation of the contract. It shall also remove any litter or obstruction and  redress any change in the condition of the place of acceptance as required by the contract.  31.7. Immediately after provisional acceptance, the contracting authority may make use of all  the supplies delivered.  32.1. The contractor shall warrant that the supplies are new, unused, of the most recent models  and incorporate all recent improvements in design and materials, unless otherwise  provided in the contract. The contractor shall further warrant that all supplies shall have  no defect arising from design, materials or workmanship, except insofar as the design or  materials are required by the specifications, or from any act or omission, that may  develop under use of the supplies in the conditions obtaining in the country of the  contracting authority. 32.2. The contractor shall be responsible for making good any defect in, or damage to, any part  of the supplies which may appear or occur during the warranty period and which:  a) results from the use of defective materials, faulty workmanship or design of the  contractor; and/or  b) results from any act or omission of the contractor during the warranty period;  and/or  c) appears in the course of an inspection made by, or on behalf of, the contracting  authority.  32.3. The contractor shall at its own cost make good the defect or damage as soon as  practicable. The warranty period for all items replaced or repaired shall recommence from  the date when the replacement or repair was made to the satisfaction of the project  manager. If the contract provides for partial acceptance, the warranty period shall be  extended only for the part of the supplies affected by the replacement or repair.  32.4. If any such defect appears or such damage occurs during the warranty period, the  contracting authority or the project manager shall notify the contractor. If the contractor  August 2020 c4e_annexigc_en  Page 26 of 36  Article 32 -  Warranty obligations 