art. 25-bis of the DPR 600/73 https://def.finanze.it/DocTribFrontend/getArticoloDetailFromResultList.do?id={3BB076B5-3306-4B2A-BB50-398BE3E10F67}&codiceOrdinamento=200002500000200&idAttoNormativo={178F0CBC-1969-49F3-974E-7C0E87B9A568}

Suggests withholding tax for Customers and vendors. Italian localization doesn't contain withholding tax for Customers, also it is legally required. Need it to be extended like in UK, and some other localizations.