The butterfat / protein files appear in Receipts / debtor sales input screens when the itemcode is 1 and the date on the transaction is later than 1/1/2018,
i.e. the butterfat/ protein is only required for milk transactions entered with a date of 2018, so this is relevant to a book starting in mar 2017. The butterfat and protein does not appear on transactions where the date is in 2017. The butterfat and protein fields are available when the transaction is dated in 2018. The final checks also follow this rule.