# DT-CIUS-PT-080

Source: https://xmlvalid.com/rules/DT-CIUS-PT-080

> The BT-83 does not meet the defined format: it is mandatory to prefix the value with the following '#REFERENCE@ATMPAYMENT#' or '#REFERENCE@DUCPAYMENT#' and suffice with '#'.

- Level: error
- Rule sets: CIUS-PT rules (Portugal, UBL) 2.1.1
- Context: `//ubl:Invoice/cac:PaymentMeans/cbc:PaymentID | //cn:CreditNote/cac:PaymentMeans/cbc:PaymentID`
- Test: `(matches(.,'^(#(REFERENCE@ATMPAYMENT)#(.{1,20})#)$') or matches(.,'^(#(REFERENCE@DUCPAYMENT)#(.{1,20})#)$'))`

Validate a document against these rules: https://xmlvalid.com/validate