...
Type: Invoice - please note that this is case sensitive and needs to be written with a capital I and the rest lower case
Creation Date and Time: the GS1 standard date format is to be used which can be include milliseconds and different time zones if required so the below are all acceptable
...
Invoice Type: INVOICE or CREDIT_NOTE - please note this is case sensitive and needs to be in capitals
Invoice Currency Code: GBP
...