FI Intrastat

StatisticalNumber

YY Derived from DocumentDateTime(last 2 digits of year)
CO constant "11"
DDD Derived from DocumentDateTime(convert MM-DD to format DDD - this is total count of days in a year)
REG derived from TaxID where schemeName = "TaxDeclarationNumber"
NNN constant "001"
Note: For example:

DocumentDateTime = 2017-02-02

TaxID = XAX

Output:

1711XAX033001

TransportationMethodCode

See Generic code list.

PeriodID

PeriodID
Map "01" for month if value is 1.
Map "02" for month if value is 2.
Map "03" for month if value is 3.
Map "04" for month if value is 4.
Map "05" for month if value is 5.
Map "06" for month if value is 6.
Map "07" for month if value is 7.
Map "08" for month if value is 8.
Map "09" for month if value is 9.
Map "10" for month if value is 10.
Map "11" for month if value is 11.
Map "12" for month if value is 12.