[ibr-005-ae]-Frequency of billing (BTAE-06) should be taken from the frequency of billing code list.
ibr-005-ae
cac:InvoicePeriod/cbc:DescriptionCode
((not(contains(normalize-space(.), ' ')) and contains(' DLY WKY Q15 MTH Q45 Q60 QTR YRL HYR OTH ', concat(' ', normalize-space(.), ' '))))