Should any amount remain unpaid for more than three months due to an omission or error, interest shall be allowed on the sum unpaid. The interests shall be calculated according to an annual net interest rate of 4.5% and will be revised every two year period by mutual agreement of the parties.
Notwithstanding to the above, the insurer's liability under this agreement shall in no circumstances be increased because of the inability of the Master Policy Holder to detect and/or to handle from an administration stand point, insured's being covered by the insurers under more than one policy insured under this agreement.