Meaning of imputability

Would you please explain the meaning of below underlined part?

I don't get the meaning of imputability.

At the absolute discretion of Refrigera Industriale the buyer shall be entitled to the free replacement and/or repair and/or modification of faulty Products, which the buyer is required to send at the seller’s expense to the warehouse of Refrigera Industriale, accompanied by the related invoice number and a comprehensive description of the defect and/or fault, subject to verification by Refrigera Industriale staff of the imputability of the alleged defects and/or faults to Refrigera Industriale.