Jos? Manuel L?pez Vald?s, president of the Association of Commercial Banks, told El Caribe that the savings certificates being sold by the Central Bank are unnecessary. ?We understand that at this time the liquidity is adequate for the operations of banks in our country and we do not feel it is opportune to restrict any more money in circulation,? he said, after participating in the weekly breakfast that President Hip?lito Mej?a has been scheduling with executives of the leading banking organizations.