[aligned-ibrp-017]-The last 4 to 6 digits of the Payment card primary account number (ibt-87) MUST be present if Payment card information (ibg-18) is provided in the Invoice.
aligned-ibrp-017
cac:PaymentMeans/cac:CardAccount
string-length(cbc:PrimaryAccountNumberID)>=4 and string-length(cbc:PrimaryAccountNumberID)<=6