Какими средствами можно контролировать уникальность артикулов вводимой номенклатуры?

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.noscript{display:inherit!important} .script{display:none!important} .w.loading > *,.l.loading > *{visibility:inherit} .w.loading,.l.loading{cursor:inherit;background:inherit;background-position:inherit} .l.loading{margin:inherit;padding:inherit} #other_sites_link {display:none} #contact {margin-top:12px}