# DT-CIUS-PT-079.1

Source: https://xmlvalid.com/rules/DT-CIUS-PT-079.1

> The BT-81 does not meet the defined format: it is mandatory to prefix the value with the following '#ENTITY@ATMPAYMENT#' and suffice with '#'.

- Level: error
- Rule sets: CIUS-PT rules (Portugal, UBL) 2.1.1
- Context: `//ubl:Invoice/cac:PaymentMeans/cbc:PaymentMeansCode | //cn:CreditNote/cac:PaymentMeans/cbc:PaymentMeansCode`
- Test: `starts-with(normalize-space(.),'#ENTITY@ATMPAYMENT#') and not(matches(.,'^(#(ENTITY@ATMPAYMENT)#(.{1,20})#)$'))`

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