For Swedish suppliers using Swedish Bankgiro or Plusgiro, the proper way to indicate this is to use Code 30 for PaymentMeans and FinancialInstitutionBranch ID with code SE:BANKGIRO or SE:PLUSGIRO
//cac:PaymentMeans[//cac:AccountingSupplierParty/cac:Party[cac:PostalAddress/cac:Country/cbc:IdentificationCode = 'SE'] and (cbc:PaymentMeansCode = normalize-space('50') or cbc:PaymentMeansCode = normalize-space('56'))]false()