[BR-CL-06-GST-SG]-Invoice period description code must be according to UNCL 2005 D.16B.
BR-CL-06-GST-SG
cac:InvoicePeriod/cbc:DescriptionCode
((not(contains(normalize-space(.), ' ')) and contains(' 3 35 432 ', concat(' ', normalize-space(.), ' '))))